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J/AJ/113/806            M-Subdwarfs             (Gizis 1997)

M-Subdwarfs: Spectroscopic Classification and the Metallicity Scale Gizis J.E. <Astron. J., 113, 806 (1997)> =1997AJ....113..806G
ADC_Keywords: Stars, M-type; Spectroscopy; Radial velocities; Stars, population II; Stars, subdwarf; Photometry Description: We present a spectroscopic classification system for M-dwarfs and M-subdwarfs based on quantitative measures of TiO and CaH features in the region 6200 - 7400 Angstroms. Our sample of cool stars covers the range from solar metallicity stars to the most extreme subdwarfs known. Using synthetic spectra computed by Allard and Hauschildt (1995), we derive metallicities for the stars. Stars are classified as dwarfs (M V), subdwarfs (sdM), or extreme subdwarfs (esdM). These classifications correspond to [m/H] = 0.0, -1.2, and -2.0 respectively. Our metallicity scale agrees with theoretical HR diagrams and HST globular cluster measurements. We discuss some nearby subdwarfs of particular interest in light of our metallicity scale. We include photometry compiled from the literature. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 65 79 Spectroscopic observations (table 2) table4.dat 70 91 Photometry (table 4)
See also: III/198 : PMSU (Palomar/MSU nearby star spectroscopic survey; Hawley+ 1997) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
2- 6 A5 --- LHS *Number in LHS catalog 8- 21 A14 --- Name *Other name 23- 27 F5.3 --- TiO5 TiO5 index: F(7126-7135)/F(7042-7046) 29- 33 F5.3 --- CaH1 CaH1 index: F(6380-6390)/F (6345-6355,6410-6420)) 35- 39 F5.3 --- CaH2 CaH2 index: F(6814-6846)/F(7042-7046) 41- 45 F5.3 --- CaH3 CaH3 index: F(6960-6990)/F(7042-7046) 47- 52 F6.1 km/s RV *Radial Velocity 54- 60 A7 --- Sp Spectral type 62- 65 A4 --- code *Telescope code
Note on LHS, Name: Gl - Gliese (1969, Veroff. Astr. Rechen-Instituts, Heidelberg, Nr. 22) GJ - Gliese & Jahreiss =1979A&AS...38..423G Wo - Woolley et al (1970, R. Obs. Ann., No. 5) =Cat. V/32 LHS - Luyten Half-Second Catalogue =Cat. I/87 LP - Luyten Palomar proper-motion catalogue G - Giclas et al (1971, Lowell Proper Motion Survey) =Cat. I/79 Sm - Smethers, see Reid (1982, MNRAS, 201, 51) TVLM - Tinney Very Low Mass, see Tinney et al. (1995AJ....110.3014T) Note on RV: Radial velocity for LHS 2715 has been deleted; it was incorrect. Note on code: Source of spectroscopic data: 60 - Palomar 60-in. telescope 100 - Las Campanas 100-in. telescope 200 - Hale 200-in. (Palomar) telescope 200a - Hale 200-in. (Palomar) telescope, August 1995 setup RHG - Taken from Reid et al. (1995AJ....110.1838R)
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
2- 6 A5 --- LHS Number in LHS catalog 8- 12 F5.2 mag V Apparent V magnitude 14- 17 F4.2 mag B-V ? B-V color 19- 22 F4.2 mag V-R ? V-R (Cousins) color 24- 27 F4.2 mag R-I ? R-I (Cousins) color 29- 32 F4.2 mag V-I ? V-I (Cousins) color 34- 39 F6.4 arcsec Plx ? Trigonometric parallax 41- 46 F6.4 arcsec e_Plx ? Uncertainty σ of parallax 49- 53 F5.2 mag DeltaLK *? Lutz-Kelker correction 55- 59 F5.2 mag MV *? Absolute V magnitude 61- 70 A10 --- ref *Source of parallax and photometry
Note on DeltaLK: Blank in Lutz-Keller correction indicates a null. -9.99 indicates that the Lutz-Kelker correction is undefined but < -0.80, as symbolized by "L" in the original paper. Note on MV: Absolute magnitude of LHS 2497 includes 0.75 magnitude correction for unresolved companion Note on ref: Dr. Jahreiss has brought to our attention the fact that DF89's photometry of LHS 272 is inconsistent with the results of Doyle and Butler (1990A&A...235..335D), Eggen, and Weis. Our comparison of the spectrum to other subdwarfs suggests that DF89's photometry is too red; thus, we adopt the other photometry for this electronic version. References for the trigonometric parallaxes and photometry are: B - Bessell (1990A&AS...83..357B) CNS3 - Gliese and Jahreiss (1991, ADC Cat. 5070) DF89 - Dawson and Forbes (1989PASP..101..614D) DF92 - Dawson and Forbes (1992AJ....103.2063D) E79 - Eggen (1979ApJS...39...89E) E87 - Eggen (1987AJ.....93..379E) HD - Harrington and Dahn (1980AJ.....85..454H) L - Leggett (1992ApJS...82..351L) M92 - Monet et al. (1992AJ....103..638M) R - Ryan (1992AJ....104.1144R) RA - Ruiz and Anguita (1993AJ....105..614R) S - SIMBAD T - Tinney et al. (1995AJ....110.3014T) W84 - Weis (1984ApJS...55..289W) W88 - Weis (1988AJ.....96.1710W) W91 - Weis (1991AJ....101.1882W) WU - Weis and Upgren (1982PASP...94..821W) Y - Van Altena et al. (1991)
References: Bessell, 1990, Astron. Astrophys. Suppl. 83, 357. (1990A&AS...83..357B) Dawson & Forbes, 1992, Astron. J. 103, 2063. (1992AJ....103.2063D) Dawson & Forbes, 1989, Pub. Astron. Soc. Pac. 101, 614. (1989PASP..101..614D) Doyle and Butler, 1990, Astron. Astrophys. 235, 335. (1990A&A...235..335D) Eggen, 1979, Astrophys. J. Suppl. 39, 89. (1979ApJS...39...89E) Eggen, 1987, Astron. J. 92, 379. (1987AJ.....93..379E) Giclas et al., 1971, Lowell Proper Motion Survey (Flagstaff, AZ: Lowell Obs.). ADC Cat. 1079. Gliese & Jahreiss, 1991, Preliminary Version of the Third Catalog of Nearby Stars (CNS3), ADC Cat. 5070 Gliese, 1969, Veroff. Astr. Rechen-Instituts, Heidelberg, Nr. 22. Gliese & Jahreiss, 1979, Astron. Astrophys. Suppl., 38, 423. (1979A&AS...38..423G) Gizis, 1997, Astron. J., 113, 806 (1997AJ....113..806G) Harrington & Dahn, 1980, Astron. J. 85, 454. (1980AJ.....85..454H) Leggett, 1992, Astrophys. J. Suppl. 82, 351. (1992ApJS...82..351L) Luyten, 1979, Catalogue of stars with proper motions exceeding 0.5 arcsec annually (Minneapolis: U Minnesota). ADC Cat. 1098 Monet et al., 1992, Astron. J. 103, 638. (1992AJ....103..638M) Reid, 1982, Mon. Not. R. Astron. Soc. 201, 51. (1982MNRAS.201...51R) Reid et al., 1995, Astron. J. 110, 1838. (1995AJ....110.1838R) Ruiz & Anguita, 1993, Astron. J. 105, 614. (1993AJ....105..614R) Ryan, 1992, Astron. J. 104, 1144. (1992AJ....104.1144R) Tinney et al., 1995, Astron. J. 110, 3014. (1995AJ....110.3014T) Van Altena et al., 1991, General Catalog of Trigonometric Stellar Parallaxes: Preliminary Version. (See ADC Cat. 1238) Weiss, 1984, Astrophys. J. Suppl. 55, 289. (1984ApJS...55..289W) Weiss, 1988, Astron. J. 96, 171. (1988AJ.....96.1710W) Weiss, 1991, Astron. J. 101, 1882. (1991AJ....101.1882W) Weis & Upgren, 1982, Pub. Astron. Soc. Pac. 94, 821. (1982PASP...94..821W) Woolley et al., 1970, R. Obs. Ann., No. 5. ADC Cat. 5032.
(End) John Gizis [U.Mass] 15-Dec-1997
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