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J/A+A/325/647      High-resolution spectra south of Taurus    (Neuhaeuser+ 1997)

Optical high-resolution spectroscopy of ROSAT detected late-type stars south of the Taurus molecular clouds Neuhauser R., Torres G., Sterzik M.F., Randich S. <Astron. Astrophys. 325, 647 (1997)> =1997A&A...325..647N (SIMBAD/NED BibCode)
ADC_Keywords: Stars, late-type ; Radial velocities ; Rotational velocities Mission_Name: ROSAT Keywords: stars: formation - stars: late-type - stars: pre-main sequence - X-rays: stars Description: Listed are results from our high-resolution data for all stars in our study area which were listed by either Magazzu et al. (1997A&AS..124..449M) or Alcala et al. (1996A&AS..119....7A), i.e. T Tauri candidates from the ROSAT All-Sky Survey. In table 1, we list all stars for which lithium was found either by Magazzu et al. (1997A&AS..124..449M) or in our CASPEC spectra, as well as two stars identified as wTTS by Alcala et al. (1996A&AS..119....7A). Listed are the designation, number of single-order echelle spectra taken, effective temperatures, projected rotational velocities, mean heliocentric radial velocities with errors, radial velocities in the local standard of rest, and remarks on variability in radial velocity as found in our high-resolution spectra. For comparison, we also list the results on spectral types of the stars (with `e' for Hα emission) as found by Magazzu et al. (1997A&AS..124..449M) (or Alcala et al., 1996A&AS..119....7A) with low- and medium-resolution spectroscopy. In the last two columns, we list the (NLTE) lithium abundance (given on a scale where logN(H)=12) and the lithium excess above the relevant Pleiades upper envelope; upper limits indicate stars where the Magazzu et al. (1997A&AS..124..449M) spectra suffer from either low S/N or low resolution. In table 2, we list all stars where no lithium was detected -- neither by Magazzu et al. (1997A&AS..124..449M) nor in our CASPEC spectra. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1 89 56 High-resolution data for lithium-rich ROSAT source counterparts table2 78 55 High-resolution data for ROSAT sources with undetected lithium
Byte-by-byte Description of file: table1
Bytes Format Units Label Explanations
1- 16 A16 --- Name Name of objects (1) 18- 19 I2 --- No Number of high-resolution observations 22- 25 I4 K Teff ? Effective temperature 27- 29 I3 km/s vsini ? Rotational velocity v sin i 32- 36 F5.1 km/s HRV ? Heliocentric radial velocity 39- 42 F4.1 km/s e_HRV ? Error in radial velocity 45- 49 F5.1 km/s RVlsr ? Local-standard-of-rest radial velocity 52- 59 A8 --- Rem Remarks (2) 61- 71 A11 --- M97 Results from Magazzu et al. (1997A&AS..124..449M) (3) 73- 75 F3.1 [Sun] NLi ? log of Lithium abundance N(Li) 76 A1 --- n_NLi [?] Unknown value 78- 82 F5.2 0.1nm dEW(Li) ? Lithium excess above ZAMS level 83 A1 --- n_dEW(Li) [?] Unknown value 85- 88 F4.2 0.1nm ULdEW(Li) ? Upper limits on Lithium excess above ZAMS level
Note (1): Row 1 to 9: K-type stars with lithium excess south of Taurus: PMS stars younger than 30 million years Row 10 to 18: K-type stars located on lambda Ori with lithium excess: PMS stars younger than 30 million years Row 19 to 33: F8- to G9-type stars with lithium excess: ZAMS stars older than 30 million years Row 34 to 40: Lithium upper limits due to low S/N or low-resolution spectra Row 41 to 56: Stars with lithium, but without lithium excess: ZAMS stars older than 100 million years Note (2): SB 1 or 2: single- or double-lined spectroscopic binaries. Note (3): (N): Listed as "wTTS" in Neuhaeuser et al. (1995A&A...299L..13N) (1): Spectral type given by Alcala et al. (1996A&AS..119....7A), who identified these stars as wTTS. (2): SB as found in our CASPEC spectrum; components NW and SE are separated by 14 arcsec (Magazzu et al., 1997A&AS..124..449M) (3): SB as found by Magazzu et al. (1997A&AS..124..449M), who found lithium in both components; data given here are for the primary, which is much brighter. (4): We have revised EW(Li) down to 0.25 Angstrom from the value given in Magazzu et al. (1997A&AS..124..449M), which apparently was too large due to an incorrect assumption on the continuum level. (5): Classified as a wTTS by N95c, but as a dKe star by Magazzu et al. (1997A&AS..124..449M); we detect lithium in our CASPEC spectrum but not in excess of the Pleiades level, and conclude that this star is a K5 ZAMS star. (6): Magazzu et al. (1997A&AS..124..449M) detected lithium, but did not classify this star as `PMS' or `PMS?'. (7) Lithium data from our high-resolution CASPEC spectra. (8) Orbit known (Torres et al., in preparation).
Byte-by-byte Description of file: table2
Bytes Format Units Label Explanations
1- 16 A16 --- Name Name of objects 18- 19 I2 --- no Number of high-resolution observations 22- 25 I4 K Teff ? Effective temperature 27- 29 I3 km/s vsini ? Rotational velocity v sin i 31- 33 I3 km/s ULvsini ? Upper limit on v sin i 35- 39 F5.1 km/s HRV ? Heliocentric radial velocity 42- 45 F4.1 km/s e_HRV ? Error in radial velocity 48- 52 F5.1 km/s RVlsr ? Local-standard-of-rest radial velocity 55- 63 A9 --- remarks Remarks (1) 66- 72 A7 --- M97 Results from Magazzu et al. (1997A&AS..124..449M)
Note (1): SB 1 or 2: single- or double-lined spectroscopic binaries. If "orbit" is given, then the orbit is known (Torres et al., in prep.) (1): Lines in high-resolution spectra are too broad to obtain reliable data.
Acknowledgements: Ralph Neuhaeuser
(End) Ralph Neuhaeuser [MPE Garching], Patricia Bauer [CDS] 22-Jul-1997
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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