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J/MNRAS/393/538     Stellar association around gamma Vel     (Jeffries+, 2009)

The stellar association around gamma Velorum and its relationship with Vela OB2. Jeffries R.D., Naylor T., Walter F.M., Pozzo M.P., Devey C.R. <Mon. Not. R. Astron. Soc., 393, 538-556 (2009)> =2009MNRAS.393..538J
ADC_Keywords: Associations, stellar ; Stars, pre-main sequence ; X-ray sources Keywords: stars: formation - stars: pre-main-sequence - stars: Wolf-Rayet - open clusters and associations: individual: Vela OB2 Abstract: We present the results of a photometric BVI survey of 0.9deg2 around the Wolf-Rayet binary gamma2 Vel and its early-type common proper motion companion gamma1 Vel (together referred to as the gamma Vel system). Several hundred pre-main-sequence (PMS) stars are identified and the youth of a subset of these is spectroscopically confirmed by the presence of lithium in their atmospheres, Halpha emission and high levels of X-ray activity. We show that the PMS stars are kinematically coherent and spatially concentrated around gamma Vel. The PMS stars have similar proper motions to gamma Vel, to main-sequence (MS) stars around gamma Vel and to early-type stars of the wider Vela OB2 association of which gamma2 Vel is the brightest member. Description: A photometric survey of an area around gamma Vel was performed at the Cerro Tololo Interamerican Observatory (CTIO) 0.9-m telescope. The survey was done in two parts in different years, but using the same instrumentation and filters, namely a Tek 2048x2048 CCD with a 13.5x13.5 arcmin2 field of view, the Harris B and V filters and a Kron-Cousins I filter. The first set of observations, described in Pozzo et al. (2000MNRAS.313L..23P), consisted of eight overlapping fields surveyed on the night beginning 1999 February 8. The second set of observations consisted of 20 fields which were surveyed on the nights beginning 2002 February 8, 10 and 11. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 100 86972 The photometric catalogue for a 0.9deg2 area around gamma Vel table3.dat 141 91 Spectroscopy results table4a.dat 150 136 *X-ray sources from the 2XMM catalogue which are correlated with 131 unflagged PMS optical counterparts in our photometric catalogue, those lying above the locus defined in Fig. 4 table4b.dat 150 124 X-ray sources from the 2XMM catalogue which are correlated with 124 optical counterparts lying below the PMS selection locus shown in Fig. 4
Note on table4a.dat: appended with the details for five sources correlated with PMS counterparts that have flagged photometry, but which were included as spectroscopic targets.
See also: IX/40 : XMM-Newton 2nd Incremental Source Catalogue (2XMMi) (XMM-SSC, 2008) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 7 A7 --- [JNW2009] Identification number FF-NNNN 9- 10 I2 h RAh Right ascension (J2000) 12- 13 I2 min RAm Right ascension (J2000) 15- 20 F6.3 s RAs Right ascension (J2000) 22 A1 --- DE- Declination sign (J2000) 23- 24 I2 deg DEd Declination (J2000) 26- 27 I2 arcmin DEm Declination (J2000) 29- 33 F5.2 arcsec DEs Declination (J2000) 35- 42 F8.3 pix Xpos X position 44- 51 F8.3 pix Ypos Y position 53- 58 F6.3 mag Vmag Johnson V magnitude 60- 64 F5.3 mag e_Vmag rms uncertainty on Vmag 66- 67 A2 --- q_Vmag V band quality flag (G1) 69- 74 F6.3 mag B-V Johnson B-V colour index 76- 80 F5.3 mag e_B-V rms uncertainty on B-V 82- 83 A2 --- q_B-V B-V band quality flag (G1) 85- 90 F6.3 mag V-Ic Johnson-Cousins V-Ic colour index 92- 97 F6.3 mag e_V-Ic rms uncertainty on V-Ic 99-100 A2 --- q_V-Ic V-Ic band quality flag (G1)
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1 I1 --- Night [1/2] Night the spectra were obtained (1) 3- 9 A7 --- [JNW2009] Identification number FF-NNNN 11- 19 F9.5 deg RAdeg Right ascension in decimal degrees (J2000) 21- 29 F9.5 deg DEdeg Declination in decimal degrees (J2000) 31- 36 F6.3 mag Vmag Johnson V magnitude 38- 43 F6.4 mag e_Vmag rms uncertainty on Vmag 45- 46 A2 --- q_Vmag Johnson V band quality flag (G1) 48- 52 F5.3 mag B-V Johnson B-V colour index 54- 59 F6.4 mag e_B-V rms uncertainty on B-V 61- 62 A2 --- q_B-V B-V band quality flag (G1) 64- 68 F5.3 mag V-Ic Johnson-Cousins V-Ic colour index 70- 75 F6.4 mag e_V-Ic rms uncertainty on V-Ic 77- 78 A2 --- q_V-Ic V-Ic band quality flag (G1) 80- 82 I3 --- S/N Signal-to-noise ratio per pixel for the spectrum estimated from the continuum around the LiI line 84- 89 F6.2 0.1nm EW(Ha) Halpha equivalent width (2) 91- 94 F4.2 0.1nm e_EW(Ha) rms uncertainty on EW(Ha) 96- 99 F4.2 0.1nm EW(Li) Lithium (LiI 6708Å) equivalent width 101-104 F4.2 0.1nm e_EW(Li) rms uncertainty on EW(Li) (3) 106-108 I3 km/s HRV ? Heliocentric radial velocity measured from the spectrum 110-114 F5.1 mas/yr pmRA ? NOMAD proper motion along RA 116-118 F3.1 mas/yr e_pmRA ? rms uncertainty on pmRA 120-124 F5.1 mas/yr pmDE ? NOMAD proper motion along DE 126-128 F3.1 mas/yr e_pmDE ? rms uncertainty on pmDE 130-133 A4 --- Com Comments on the cross-correlation function (ccf) used to derive the RV (4) 135-139 F5.2 [solLum] logLX ? X-ray luminosity 141 I1 --- Mm [1/3] Membership flag (5)
Note (1): Night the spectra were obtained: 1 = 1999 November 24 2 = 1999 November 25 Note (2): a negative value indicates absorption Note (3): a zero uncertainty indicates that the quoted EW(Li) is a 2σ upper limit. Note (4): Comments as follows: SB2 = double peaked ccf SB2? = possible double peaked ccf RR = star is probably a rapid rotator (in excess of ~=30km/s) E = early-type spectrum Note (5): Membership flag as follows: 1 = member 2 = non-member 3 = uncertain membership
Byte-by-byte Description of file: table4a.dat table4b.dat
Bytes Format Units Label Explanations
1- 5 A5 --- --- [2XMMp] 7- 22 A16 --- 2XMMp 2XMMp designation (JHHMMSS.s+DDMMSS) 24 I1 --- Obs [1/2] Observation number (1) 26- 32 E7.2 --- ML Source detection likelihood 34- 41 E8.3 ct/s pn Count rate in the 0.5-4.5keV range for the pn instrument (2) 43- 49 E7.3 ct/s e_pn rms uncertainty on pn 51- 58 E8.3 ct/s m1 Count rate in the 0.5-4.5keV range for the m1 instrument (2) 60- 66 E7.3 ct/s e_m1 rms uncertainty on m1 68- 75 E8.3 ct/s m2 Count rate in the 0.5-4.5keV range for the m2 instrument (2) 77- 83 E7.3 ct/s e_m2 rms uncertainty on m2 85- 87 F3.1 arcsec Sep Separation between X-ray source and optical counterpart 89- 95 A7 --- [JNW2009] Identification number FF-NNNN 97-105 F9.5 deg RAdeg Optical source right ascension in decimal degrees (J2000) 107-115 F9.5 deg DEdeg Optical source declination in decimal degrees (J2000) 117-122 F6.3 mag Vmag Johnson V magnitude of optical counterpart 124-128 F5.3 mag V-Ic Johnson-Cousins V-Ic colour index of optical counterpart 130-137 E8.3 mW/m2 Flux Average unabsorbed X-ray flux (0.5-4.5keV) 139-144 F6.3 mag BC Assumed V-band bolometric correction 146-150 F5.2 [-] log(LX/LBol) Derived X-ray to bolometric flux ratio
Note (1): Observation code: 1 = the observation beginning on MJD 52013 2 = the observation beginning on MJD 52033 Note (2): a zero here indicates the source was not found in that detector.
Global notes: Note (G1): Quality flag as follows: O = O.K. N = Non-stellar E = Too close to CCD edge B = Background fit failed I = Ill-determined background P = Position fit failed S = Saturated E = Too close to edge F = Flagged pixel R = Uncalibrated region A = Absent input data M = Negative (minus) counts V = Variable C = Large relative transparency correction (cloudy)
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 20-Oct-2009
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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