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J/A+A/433/151  Spectrocopic results on ROSAT late-type stars  (Zickgraf+, 2005)

Identification of a complete sample of northern ROSAT All-Sky Survey X-ray sources. VIII. The late-type stellar component. Zickgraf F.-J., Krautter J., Reffert S., Alcala J.M., Mujica R., Covino E., Sterzik M.F. <Astron. Astrophys., 433, 151-171 (2005)> =2005A&A...433..151Z
ADC_Keywords: X-ray sources ; Stars, late-type ; Abundances ; Radial velocities ; Space velocities ; Proper motions Keywords: surveys - X-rays: stars - stars: late-type - stars: pre-main sequence - stars: kinematics - solar neighbourhood Abstract: We present results of an investigation of the X-ray properties, age distribution, and kinematical characteristics of a high-galactic latitude sample of late-type field stars selected from the ROSAT All-Sky Survey (RASS). The sample comprises 254 RASS sources with optical counterparts of spectral types F to M distributed over six study areas located at |b|≳20°, and Dec≥-9°. A detailed study was carried out for the subsample of ∼200 G, K, and M stars. Lithium abundances were determined for 179 G-M stars. Radial velocities were measured for most of the 141 G and K type stars of the sample. Combined with proper motions these data were used to study the age distribution and the kinematical properties of the sample. Based on the lithium abundances half of the G-K stars were found to be younger than the Hyades (660Myr). About 25% are comparable in age to the Pleiades (100Myr). A small subsample of 10 stars is younger than the Pleiades. They are therefore most likely pre-main sequence stars. Kinematically the PMS and Pleiades-type stars appear to form a group with space velocities close to the Castor moving group but clearly distinct from the Local Association. Description: Paper III (Appenzeller et al., 1998, Cat. J/ApJS/117/319) presents a catalogue of optical identifications for 685 RASS sources contained in six study areas. The catalogue contains 254 X-ray sources which have been identified as coronal emitters of spectral types F to M. The stellar sample of G to M above was observed spectroscopically during several observing runs. Low-resolution spectra were obtained with CAFOS, high-resolution spectra were observed with FOCES, both attached to the 2.2m telescope at Calar Alto observatory (CA), Spain. Further high- and medium-resolution observations were obtained at the Observatoire de Haute Provence (OHP), France, with the spectrographs AURELIE and CARELEC at the 1.52m and 1.93m telescopes, respectively. A few supplementary high- and low-resolution observations were obtained at European Southern Observatory, La Silla, Chile (ESO), with CASPEC at the ESO 3.6m telescope and DFOSC at the Danish 1.54m telescope, respectively. A further observing run of 5 nights at Calar Alto observatory in February 2001 was lost due to bad weather conditions. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tablea2.dat 80 205 Basic optical and X-ray parameters of the sample of G-, K-, and M-type stars. tablea3.dat 93 205 Kinematical parameters tablea4.dat 42 205 Lithium abundances and rotational velocities
See also: J/ApJS/117/319 : Northern RASS X-ray sources catalog (Appenzeller+ 1998) Byte-by-byte Description of file: tablea2.dat
Bytes Format Units Label Explanations
1- 4 A4 --- [ATZ98] Source name 6- 20 A15 --- RXJ RASS name (RX JHHMM.m+DDMM) 22- 23 I2 h RAh Right ascension (J2000) 25- 26 I2 min RAm Right ascension (J2000) 28- 31 F4.1 s RAs Right ascension (J2000) 33 A1 --- DE- Declination sign (J2000) 34- 35 I2 deg DEd Declination (J2000) 37- 38 I2 arcmin DEm Declination (J2000) 40- 41 I2 arcsec DEs Declination (J2000) 43- 50 A8 --- SpType MK spectral type 52- 54 A3 --- SB Spectroscopic binary type (SB2 or SB3) 56- 60 F5.2 mag Vmag ?=- V magnitude 62- 66 F5.2 [-] logFx/Fv ?=- X to visual flux ratio 68- 71 I4 pc Dist ?=- Heliocentric distance 72 A1 --- u_Dist Uncertainty flag on Diat 74 A1 --- n_Dist [MISTH] Method from which the distance was calculated (1) 76- 80 F5.2 10-7W logLx ?=- X-ray luminosity calculated using the distance Dist
Note (1): Method from which the distance was calculated as follows: S = spectroscopy H = Hipparcos T = trigonometric parallaxes I = infrared colours M = assuming luminosity class V
Byte-by-byte Description of file: tablea3.dat
Bytes Format Units Label Explanations
1- 4 A4 --- [ATZ98] Source name 6- 13 A8 --- SpType MK spectral type type 15- 18 I4 km/s HRV1 ?=- Heliocentric radial velocity (of the primary for binaries) 20- 21 I2 km/s e_HRV1 ?=- rms uncertainty on HRV1 23- 26 I4 km/s HRV2 ?=- Heliocentric radial velocity of the secondary for binaries 28 I1 km/s e_HRV2 ?=- rms uncertainty on HRV2 30- 36 F7.1 mas/yr pmRA ?=- Proper motion, µαcosδ 38- 41 F4.1 mas/yr e_pmRA ?=- rms uncertainty on pmRA 43- 49 F7.1 mas/yr pmDE ?=- Proper motion, µδ 51- 54 F4.1 mas/yr e_pmDE ?=- rms uncertainty on pmDE 56- 57 A2 --- r_pmRA Source of the proper motion (1) 59- 64 F6.1 km/s UVel ?=- U velocity 66- 69 F4.1 km/s e_UVel ?=- rms uncertainty on UVel 71- 76 F6.1 km/s VVel ?=- V velocity 78- 81 F4.1 km/s e_VVel ?=- rms uncertainty on VVel 83- 88 F6.1 km/s WVel ?=- W velocity 90- 93 F4.1 km/s e_WVel ?=- rms uncertainty on WVel
Note (1): Source of the proper motions as follows: TY = Tycho-2, Cat. I/259 HI = Hipparcos, Cat. I/239 UC = UCAC2, Cat. I/289 US = USNO-B1.0, Cat. I/284 PP = PPM, Cat. I/146 & I/193 ST = STARNET, cat. I/253 TR = TRC, Cat. I/250 NL = NLPM1 CA = Carlsberg Meridian Catalogs, Cat. I/256
Byte-by-byte Description of file: tablea4.dat
Bytes Format Units Label Explanations
1- 4 A4 --- [ATZ98] Source name 6- 13 A8 --- SpType MK spectral type 16- 19 I4 K Teff Effective temperature 21 A1 --- l_EW Limit flag on EW 22- 24 I3 0.1pm EW ?=- LiI (6708Å) equivalent width 26 A1 --- Res [hlm-] (h)igh, (m)edium or (l)ow resolution spectroscopy 28 A1 --- l_logN(Li) Limit flag on logN(Li) 29- 33 F5.2 --- logN(Li) ?=- Li abundance (H=12) 35 A1 --- l_vrot1 Limit flag on vrot1 36- 38 I3 km/s vrot1 ?=- Rotational velocity (of the primary for binaries) 40- 42 I3 km/s vrot2 ?=- Rotational velocity of the secondary for binaries
History: * 11-Aug-2006: From electronic version of the journal * 12-Dec-2006: in the 3 tables, D114 appears twice in records #142 and #143, the first having an erroneous RA. References: Zickgraf et al. Paper I 1998AN....319...42Z Zickgraf et al. Paper II 1997A&AS..123..103Z Appenzeller et al., Paper III 1998ApJS..117..319A, Cat. J/ApJS/117/319 Krautter et al. Paper IV 1999A&A...350..743K Zickgraf et al. Paper V 1997A&A...323L..21Z Zickgraf et al. Paper VI 1998A&A...339..457Z Appenzeller et al., Paper VII 2000A&A...364..443A
(End) Patricia Vannier [CDS] 11-Aug-2006
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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