J/A+A/650/A146 Distant, pulsating red giants in southern halo (Mauron+, 2021)
A search for distant, pulsating red giants in the southern halo.
Mauron N., Gigoyan K.S., Kendall T.R., Hambleton K.M.
<Astron. Astrophys. 650, A146 (2021)>
=2021A&A...650A.146M 2021A&A...650A.146M (SIMBAD/NED BibCode)
ADC_Keywords: Milky Way ; Stars, giant ; Stars, M-type ; Stars, cyanogen
Keywords: stars: late-type - Galaxy: halo
Abstract:
To investigate the asymptotic giant branch (AGB) population in the
Galactic halo, we search for pulsating AGB stars at a heliocentric
distance over 50kpc. Our research is based on the Catalina Southern
Survey (CSS) catalogue of variables, comprising 1286 long-period
variables (LPVs) with declination less than -20°. We first focus
on the 77 stars in the cap abs(b)>30deg for which spectral M-type or
C-type classification can be derived from Hamburg-ESO objective prism
spectra. Most of these are oxygen-rich (M-type) and very few are
carbon rich. The periods are in the range 100-500 days, and CSS
amplitudes are up to 3mag. In this small sample, no halo AGB star is
fainter than Ks0=12.5. This may be due to the scarcity of AGBs in the
outer halo, or insufficient instrumental depth. Leaving aside spectral
information, we then searched for even fainter pulsators (Ks>12.5) in
the entire CSS catalogue. Gaia astrometry makes it possible to
identify some contaminants. Our final result is the identification of
ten candidate distant LPVs. If these ten stars obey the fundamental
mode K-band period luminosity relation used for Miras and
small-amplitude Miras, their distances are between 50 and 120kpc from
the Sun. In a diagram showing distance versus Gaia tangential
velocity, these ten stars have positions similar to those of other
objects in the halo, such as globular clusters and dwarf galaxies. We
also detect some underluminous AGBs that deserve further study. A
detailed catalogue of the 77 high-latitude M or C stars will be made
available at the CDS.
Description:
The catalog (table 5 of the paper) contains, for 77 stars,
coordinates, photometry, pulsation characteristics, distances,
astrometry from Gaia, radial velocity, 2MASS name, CSS name, proper
motion, tangential velocity.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table5.dat 275 77 Parameters for 77 stars
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See also:
I/350 : Gaia EDR3 (Gaia Collaboration, 2020)
J/MNRAS/469/3688 : CSS Periodic Variable Star Catalogue (Drake+, 2017)
Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 5 A5 ---- Name Star denomination
7- 16 F10.6 deg RAdeg Right Ascension J2000 (1)
18- 27 F10.6 deg DEdeg Declination J2000 (1)
29- 34 F6.2 deg GLON Galactic longitude
36- 41 F6.2 deg GLAT Galactic latitude
43- 48 F6.2 deg Lsgr Longitude(Sgr) (2)
50- 55 F6.2 deg Bsgr Latitude(Sgr) (2)
57- 62 F6.3 mag E(B-V) Extinction from Schlegel (3)
64- 69 F6.3 mag Ksmag0 Dereddened Ks 2MASS photometry
71- 76 F6.3 mag (J-Ks)0 Dereddened J-Ks color
78- 83 F6.2 mag KsMAG0 ?=-99 Ks-band absolute magnitude
85 I1 --- iflag [1/6] Information flag (4)
87- 91 F5.1 kpc Dkpc ?=-1 Distance (5)
93- 96 F4.1 kpc e_Dkpc ?=0 Uncertainty on Dkpc
98-104 F7.1 kpc Zkpc ?=-9999.9 Height from the Galactic plane (6)
106-110 F5.1 d P Period in days (7)
112-115 F4.2 mag Deltam Amplitude (CSS); peak-to-peak
117-121 F5.2 mag mCSS Time-averaged CSS-band magnitude (8)
123-130 F8.4 mas plx GAIA EDR3 parallax
132-139 F8.4 mas e_plx [0] GAIA EDR3 parallax error
141-148 F8.4 mas/yr pmRA GAIA EDR3 proper motion along RA, pmRA*cosDE
150-157 F8.4 mas/yr e_pmRA GAIA EDR3 error on pmRA
159-166 F8.4 mas/yr pmDE GAIA EDR3 proper motion along DE
168-175 F8.4 mas/yr e_pmDE GAIA EDR3 error on pmDE
177-184 F8.2 km/s RV ?=-9999 Heliocentric radial velocity (9)
186-190 F5.2 km/s e_RV ?=0 Uncertainty on RV (10)
192-195 A4 ---- r_RV Indicates the source of the RV (11)
197-202 A6 ---- Type Spectral type (M-type or C-type)
204-226 A23 ---- 2MASS Standard 2MASS identification
228-248 A21 ---- CSSname CSS name of star, Drake et al.
(2017MNRAS.469.3688D 2017MNRAS.469.3688D, Cat. J/MNRAS/469/3688)
250-259 A10 ---- Comm Candi/LMC/Sculp/Fornax/etc (12)
261-267 F7.4 mas/yr pm Total proper motion
269-275 F7.1 km/s Vtang ?=-9999.9 Tangential velocity (13)
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Note (1): RA and DEC from 2MASS point source catalog
Note (2): These coordinates are with respect to the mean Sgr arm plane.
They are derived from RA and DEC as given in Annex of Belokurov et al.,
2014MNRAS.437..116B 2014MNRAS.437..116B.
Note that Lsgr in this paper is L(Belokurov) when L(Belokurov) is between
0 and 180, and L(Belokurov)+360 when L(belokurov) is between
-180 and 0. The latitude BSgr is B(Belokurov).
Note (3): retrieved from Schlegel et al. (1998ApJ...500..525S 1998ApJ...500..525S) retrieved
from the IRSA database
Note (4): Information flag as follows:
0 = artefact false variable
1 = normal candidate
2 = object with Large Period and Small amplitude (D(kpc) not given)
3 = member of LMC
4 = member of SMC
5 = member of Fornax
6 = member of Sculptor
Note (5): 1 pc = 3.08567E+16 meters
Note (6): Zkpc can be positive (b>0) or negative (b<0)
Note (7): Period in days from Drake CSS catalogue.
Note (8): mCSS is from Catalina and is NOT derredened; the CSS band is close to
I-band for our LPVs
Note (9): RV=-9999.00 when no measurement is available.
Note (10): e_Vr=0 when Vr=-999.00 (no data)
Note (11): Origin of the RV as follows:
GAIA = GAIA EDR3 I/350
RAVE = RAVE (Steinmetz et al., 2006AJ....132.1645S 2006AJ....132.1645S; Kordopatis et al.,
2013AJ....146..134K 2013AJ....146..134K, Cat. III/272)
APOG = APOGEE (Majewski et al. 2017AJ....154...94M 2017AJ....154...94M)
Note (12): Comment corresponding to iflag.
Note (13): -9999.9 km/s is given when no distance is given.
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Acknowledgements:
Nicolas Mauron, nicolas.mauron(at)umontpellier.fr
(End) Patricia Vannier [CDS] 30-Apr-2021