J/AJ/161/133 Astrometry & photometry for CMa R1 members (Gregorio-Hetem+, 2021)
Searching for active low-mass stars in CMa star-forming region: multiband
photometry with T80S.
Gregorio-Hetem J., Navarete F., Hetem A., Santos-Silva T., Galli P.A.B.,
Fernandes B., Montmerle T., Jatenco-Pereira V., Fernandes M.B.,
Perottoni H.D., Schoenell W., Ribeiro T., Kanaan A.
<Astron. J., 161, 133 (2021)>
=2021AJ....161..133G 2021AJ....161..133G
ADC_Keywords: Star Forming Region; Clusters, open; Stars, pre-main sequence;
Photometry, ugriz; Parallaxes, trigonometric; Proper motions
Keywords: Pre-main sequence stars ; Star-forming regions ; Young star clusters
Abstract:
An exotic environment surrounds the young stellar groups associated
with the Canis Major (CMa) OB1/R1 region, which probably was formed
under feedback from at least three supernova events having occurred a
few million years ago. We use astrometric data from the Gaia-DR2 to
confirm the membership of the stars in CMa R1, based on proper motion
and parallax, which revealed 514 new members and candidates. The mean
age of 5Myr estimated from the color-magnitude diagram characterizes
the sources as likely pre-main-sequence candidates. In total, a sample
of 694 stars detected with the T80-South telescope was analyzed
according to different color-color diagrams, which were compared with
theoretical colors from evolutionary models, aiming to reveal the
objects that exhibit color excess due to accretion processes.
Accretion and magnetic activity were also explored on the basis of
empirical flux-flux relation, such as F660 and F861 that are related
to Hα and CaII triplet emission, respectively. A low fraction
(∼3%) of the sample have Hα excess and other colors expected for
stars exhibiting chromospheric activity. The number of Class I and
Class II objects, identified by the infrared (Wide-field Infrared
Survey Explorer) colors, indicates a disk fraction of ∼6%, which is
lower than that expected for stellar clusters with a similar age. Such
a large sample of objects associated with CMa R1 without evidences of
circumstellar accretion can be interpreted as a lack of disk-bearing
stars, unusual for young star-forming regions. However, this may be
explained as the result of supernova events.
Description:
Optical imaging in a wide (1.4x1.4°) field-of-view (FoV), covering
the Canis Major (CMa) R1 region was performed in 2017 January 17, with
the 0.8m telescope T80-South (hereafter T80S) located at Cerro Tololo
(Chile), using five broadband SDSS filters (u', g', r', i', z') and
seven narrow-band filters centered on features particularly
interesting for our study, like CaII H+K (λ=3968.5Å,
3933.7Å), Hα (λ=6562.8Å), and CaII infrared
triplets (IRT, {lamda}=8498, 8542, 8662Å), among others.
We previously analyzed the X-ray sources detected by the ROSAT and
XMM-Newton satellites in the direction of the nebula Sh 2-296. The
characterization of the X-ray sources was based on 2MASS data of their
near-infrared counterparts for which mass and age were estimated. For
a small part (12%) of the area where the X-ray sources are found,
Fernandes+, 2015MNRAS.448...19F 2015MNRAS.448...19F obtained medium-resolution optical
spectra with GMOS (multi-object spectroscopy) at the Gemini
telescopes.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 146 155 Objects identified in the literature, giving
membership probability, parallax, proper motion,
and other data from Gaia-DR2
table5.dat 94 395 Astrometric data for new members of CMa R1
table6.dat 94 119 Astrometric data for new possible members of CMa R1
table7.dat 150 180 Photometric data for T80S sources that were
previously identified in the literature
table8.dat 151 395 Photometric data for T80S sources that are new
members of CMa R1
table9.dat 151 119 Photometric data for T80S sources that are possible
members of CMa R1
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See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
J/MNRAS/310/210 : Stellar composition of CMa R1 (Shevchenko+, 1999)
J/AJ/131/1184 : A recalibration of optical photometry (Maiz-Apellaniz+,2006)
J/AJ/134/2398 : Stellar SEDs in SDSS and 2MASS filters (Covey+, 2007)
J/ApJ/686/1195 : IR photometry in the γ Vel cluster (Hernandez+, 2008)
J/A+A/506/711 : Canis Major R1 X-ray sources (Gregorio-Hetem+, 2009)
J/ApJS/186/259 : Taurus Spitzer survey: new candidate members (Rebull+, 2010)
J/ApJ/796/127 : Spitzer h & χ Persei candidate members (Cloutier+, 2014)
J/MNRAS/440/2036 : VPHAS+ survey synthetic colours (Drew+, 2014)
J/MNRAS/441/2891 : ALHAMBRA Survey (Molino+, 2014)
J/A+A/570/A82 : Mapping accretion variability in NGC 2264 (Venuti+, 2014)
J/MNRAS/453/1026 : Lagoon Nebula M8 T tauri accretion rates (Kalari+, 2015)
J/ApJ/827/96 : WISE census of YSOs in Canis Major (Fischer+, 2016)
J/A+A/609/A127 : X-ray sources in CMa OB1 (Santos-Silva+, 2018)
J/AJ/157/85 : CIDA Variability Survey of Orion OB1. II. (Briceno+, 2019)
J/MNRAS/490/2521 : Fractal Statistics in Young Star Clusters (Hetem+, 2019)
J/A+A/630/A90 : Halpha emission-line stars in Canis Major (Pettersson+,2019)
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 A19 --- Gaia Gaia DR2 identification
21- 36 A16 --- 2MASS 2MASS identification
38- 45 F8.4 deg RAdeg [105.3/106.4] Right Ascension (J2000)
47- 54 F8.4 deg DEdeg [-12.2/-10.9] Declination (J2000)
56- 57 I2 % Prob [0/96] Membership probability
59- 63 F5.3 mas plx [0.805/1.247] Parallax
65- 69 F5.3 mas e_plx [0.02/0.4] Error in plx
71- 76 F6.3 mas/yr pmRA [-5.63/9.27] Proper motion in Right Ascension
* cos(DE)
78- 82 F5.3 mas/yr e_pmRA [0.03/0.7] Error in pmRA
84- 90 F7.3 mas/yr pmDE [-14.62/10.93] Proper motion in Declination
92- 96 F5.3 mas/yr e_pmDE [0.03/0.9] Error in pmDE
98-102 F5.2 mag Gmag [7.33/18.78] The G magnitude from Gaia DR2
104-146 A43 --- Note Additional notes (1)
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Note (1): Objects from Fernandes+, 2015MNRAS.448...19F 2015MNRAS.448...19F are indicated
by letter F. X-ray sources are denoted by letters E, W, C, and S
corresponding to fields East, West, Center and South (see Fig.1)
observed by XMM-Newton (Santos-Silva+, 2018, J/A+A/609/A127). Other
identifications and Spectral Type were compiled by Gregorio-Hetem
(2008) mainly from Claria, 1974, (C74) 1974AJ.....79.1022C 1974AJ.....79.1022C and
Shevchenko+, 1999, (SEI99) 1999MNRAS.310..210S 1999MNRAS.310..210S. The six objects in the
bottom lines were not found in the T80S catalog.
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 A19 --- Gaia Gaia DR2 identification
21- 36 A16 --- 2MASS 2MASS identification
38- 45 F8.4 deg RAdeg [105.3/106.7] Right Ascension (J2000)
47- 54 F8.4 deg DEdeg [-12.2/-10.8] Declination (J2000)
56- 57 I2 % Prob [50/96] Membership probability
59- 62 F4.2 mas plx [0.8/1.25] Parallax
64- 67 F4.2 mas e_plx [0.02/0.4] Error in plx
69- 73 F5.2 mas/yr pmRA [-5.55/-3.04] Proper motion in Right
Ascension * cos(DE)
75- 78 F4.2 mas/yr e_pmRA [0.03/0.8] Error in pmRA
80- 83 F4.2 mas/yr pmDE [0.58/2.92] Proper motion in Declination
85- 88 F4.2 mas/yr e_pmDE [0.03/0.8] Error in pmDE
90- 94 F5.2 mag Gmag [10.16/21.1] The G magnitude from Gaia DR2
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Byte-by-byte Description of file: table6.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 A19 --- Gaia Gaia DR2 identification
21- 36 A16 --- 2MASS 2MASS identification
38- 45 F8.4 deg RAdeg [105.3/106.7] Right Ascension (J2000)
47- 54 F8.4 deg DEdeg [-12.2/-10.8] Declination (J2000)
56- 57 I2 % Prob [1/49] Membership probability
59- 62 F4.2 mas plx [0.8/1.25] Parallax
64- 67 F4.2 mas e_plx [0.02/0.4] Error in plx
69- 73 F5.2 mas/yr pmRA [-5.86/-2.54] Proper motion in Right
Ascension * cos(DE)
75- 78 F4.2 mas/yr e_pmRA [0.03/0.6] Error in pmRA
80- 83 F4.2 mas/yr pmDE [0.31/2.63] Proper motion in Declination
85- 88 F4.2 mas/yr e_pmDE [0.03/0.6] Error in pmDE
90- 94 F5.2 mag Gmag [11.72/19.24] The G magnitude from Gaia DR2
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 16 A16 --- ID Object identification
18- 22 F5.2 mag umag [7.36/23.23]? The u' magnitude
24- 27 F4.2 mag e_umag [0.0/6.4]? Error in umag
29- 33 F5.2 mag m378mag [7.25/22.44]? The m378 magnitude
35- 38 F4.2 mag e_m378mag [0.0/4.19]? Error in m378mag
40- 44 F5.2 mag m395mag [7.48/23.86]? The m395 magnitude
46- 50 F5.2 mag e_m395mag [0.0/28.44]? Error in m395mag
52- 56 F5.2 mag m410mag [7.67/25.02]? The m410 magnitude
58- 62 F5.2 mag e_m410mag [0.0/29.76]? Error in m410mag
64- 68 F5.2 mag m430mag [7.76/23.98]? The m430 magnitude
70- 73 F4.2 mag e_m430mag [0.0/9.04]? Error in m430mag
75- 79 F5.2 mag gmag [8.68/21.34]? The g' magnitude
81- 84 F4.2 mag e_gmag [0.0/0.72]? Error in gmag
86- 90 F5.2 mag m515mag [7.86/20.87]? The m515 magnitude
92- 95 F4.2 mag e_m515mag [0.0/1.62]? Error in m515mag
97-101 F5.2 mag rmag [9.03/21.61]? The r' magnitude
103-106 F4.2 mag e_rmag [0.0/1.2]? Error in rmag
108-112 F5.2 mag m660mag [9.01/22.74]? The m660 magnitude
114-117 F4.2 mag e_m660mag [0.0/3.79]? Error in m660mag
119-123 F5.2 mag imag [8.95/22.75]? The i' magnitude
125-128 F4.2 mag e_imag [0.0/0.22]? Error in imag
130-134 F5.2 mag m861mag [8.96/22.44]? The m861 magnitude
136-139 F4.2 mag e_m861mag [0.0/0.45]? Error in m861mag
141-145 F5.2 mag zmag [9.21/18.41]? The z' magnitude
147-150 F4.2 mag e_zmag [0.0/0.18]? Error in zmag
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Byte-by-byte Description of file: table8.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 A19 --- Gaia Gaia DR2 identification
21- 25 F5.2 mag umag [9.41/23.67]? The u' magnitude
27- 30 F4.2 mag e_umag [0.0/9.91]? Error in umag
32- 36 F5.2 mag m378mag [7.6/23.87]? The m378 magnitude
38- 41 F4.2 mag e_m378mag [0.0/9.64]? Error in m378mag
43- 47 F5.2 mag m395mag [7.69/23.4]? The m395 magnitude
49- 52 F4.2 mag e_m395mag [0.0/9.37]? Error in m395mag
54- 58 F5.2 mag m410mag [10.18/24.16]? The m410 magnitude
60- 63 F4.2 mag e_m410mag [0.0/9.48]? Error in m410mag
65- 69 F5.2 mag m430mag [7.97/24.12]? The m430 magnitude
71- 74 F4.2 mag e_m430mag [0.0/9.89]? Error in m430mag
76- 80 F5.2 mag gmag [9.25/23.44]? The g' magnitude
82- 85 F4.2 mag e_gmag [0.0/1.98]? Error in gmag
87- 91 F5.2 mag m515mag [8.02/23.59]? The m515 magnitude
93- 96 F4.2 mag e_m515mag [0.0/7.63]? Error in m515mag
98-102 F5.2 mag rmag [9.61/22.75] The r' magnitude
104-107 F4.2 mag e_rmag [0.0/0.41] Error in rmag
109-113 F5.2 mag m660mag [7.76/20.55]? The m660 magnitude
115-118 F4.2 mag e_m660mag [0.0/1.21]? Error in m660mag
120-124 F5.2 mag imag [9.52/22.44] The i' magnitude
126-129 F4.2 mag e_imag [0.0/0.22] Error in imag
131-135 F5.2 mag m861mag [8.56/20.7] The m861 magnitude
137-140 F4.2 mag e_m861mag [0.0/0.27] Error in m861mag
142-146 F5.2 mag zmag [9.27/18.33]? The z' magnitude
148-151 F4.2 mag e_zmag [0.0/0.55]? Error in zmag
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Byte-by-byte Description of file: table9.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 A19 --- Gaia Gaia DR2 identification
21- 25 F5.2 mag umag [12.33/23.43]? The u' magnitude
27- 30 F4.2 mag e_umag [0.0/6.65]? Error in umag
32- 36 F5.2 mag m378mag [12.08/23.31]? The m378 magnitude
38- 41 F4.2 mag e_m378mag [0.0/9.61]? Error in m378mag
43- 47 F5.2 mag m395mag [12.04/23.01]? The m395 magnitude
49- 52 F4.2 mag e_m395mag [0.0/8.19]? Error in m395mag
54- 58 F5.2 mag m410mag [11.95/23.74]? The m410 magnitude
60- 63 F4.2 mag e_m410mag [0.0/7.03]? Error in m410mag
65- 69 F5.2 mag m430mag [11.98/23.53]? The m430 magnitude
71- 74 F4.2 mag e_m430mag [0.0/9.18]? Error in m430mag
76- 80 F5.2 mag gmag [11.79/21.89]? The g' magnitude
82- 85 F4.2 mag e_gmag [0.0/0.62]? Error in gmag
87- 91 F5.2 mag m515mag [11.67/21.22]? The m515 magnitude
93- 96 F4.2 mag e_m515mag [0.0/0.72]? Error in m515mag
98-102 F5.2 mag rmag [11.48/20.22] The r' magnitude
104-107 F4.2 mag e_rmag [0.0/0.56] Error in rmag
109-113 F5.2 mag m660mag [11.4/19.33]? The m660 magnitude
115-118 F4.2 mag e_m660mag [0.0/0.45]? Error in m660mag
120-124 F5.2 mag imag [11.24/20.12] The i' magnitude
126-129 F4.2 mag e_imag [0.0/0.73] Error in imag
131-135 F5.2 mag m861mag [11.13/19.15] The m861 magnitude
137-140 F4.2 mag e_m861mag [0.0/0.68] Error in m861mag
142-146 F5.2 mag zmag [11.12/18.31]? The z' magnitude
148-151 F4.2 mag e_zmag [0.0/0.24]? Error in zmag
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 28-Apr-2021