J/AJ/109/1379 J/AJ/109/1379 Praesepe & M 67 spectral standards L E Allen K M Strom Astron. J. 109 1379 1995 1995AJ....109.1379A Clusters, open MK spectral classification Photometry We present a grid of stellar classification spectra of moderate resolution (R~1500) in the range lambda lambda 5600-9000A, compiled from high signal-to-noise spectra of 275 stars, most in the open clusters Praesepe and M 67. The grid covers dwarfs from types B8 through M5, giants from G8 through M7, and subgiants from F5 through K0. We catalog atomic and molecular absorption features useful for stellar classification, and demonstrate the use of luminosity-sensitive features to distinguish between late-type dwarf and giant stars.

M 67NGC 268208 50.4 +11 49 M 44PraesepeNGC 263208 40.4 +19 40

ID Identification number number=1 In table1, ID from Jones and Stauffer (1991AJ....102.1080J) In table2, ID from Sanders (1977A&AS...27...89S) --- n_ID * when spectrum plotted number=2 *: spectrum plotted in Figure 3 for table1, in Figure 5 for table2. --- RAh Right ascension (1950) h RAm Right ascension (1950) min RAs Right ascension (1950) s DEd Declination (1950) deg DEm Declination (1950) arcmin DEs Declination (1950) arcsec Sp Adopted spectral type --- Vmag V magnitude mag B-V B-V color index mag V-I V-I color index mag Prob Probability of membership number=3 In table1, Prob from Jones and Stauffer (1991AJ....102.1080J) In table2, Prob from Girard et al. (1989AJ.....98..227G) % r_Vmag BVI photometry reference number=4 0: BVI photometry from Jones and Stauffer (1991AJ....102.1080J) 1: BV photometry from Girard et al. (1989AJ.....98..227G) 2: BVI photometry from Montgomery et al. (1993) <J/AJ/106/181> --- Notes Notes number=5 In table1: Ab = Abt (1986PASP...98..307A) Ba = Barbier (1963POHP....6...36B) BB = Boesgaard and Budge (1988ApJ...332..410B) Bi = Bidelman (1956PASP...68..318B) Bo = Bolte (1991ApJ...376..514B) CB = Crawford and Barnes (1969AJ.....74..818C) CGal = Corbally and Garrison (1986AJ.....92...90C) CGb = Corbally and Garrison (1983JRASC..77...28C) Jo = Johnson (1952ApJ...116..640J) Po = Popper (1948ApJ...108..490P) Re = Rebeirot (1966POHP....8...24R) RS = Randich and Schmitt (1994) Cat. <J/A+A/298/115> SS = Soderblom and Stauffer (1984AJ.....89.1543S) St = Stauffer (1982PASP...94..678S) Up = Upgren et al. (1979AJ.....84.1586U) Wi = Wilson (1963ApJ...138..832W) In table2: Identification cross references: F: Fagerholm ID (1906ArMAF...2s...1F) RGO: Royal Greenwich Observatory ID S: Sandage ID Previously published spectral types from: BB: Burbidge and Burbidge (1959ApJ...129..513B) Pe: Pesch (1967ApJ...148..781P) Po: Popper (1954AJ.....59..445P) --- Name Star name --- n_Name * when spectrum plotted in Figure 3 --- RAh Right ascension (1950) h RAm Right ascension (1950) min RAs Right ascension (1950) s DE- Declination sign --- DEd Declination (1950) deg DEm Declination (1950) arcmin DEs Declination (1950) arcsec Sp Spectral type --- Lambda Wavelength 0.1nm n_Lambda Separator, '-' for interval --- Lambda2 Second wavelength 0.1nm n_Lambda2 Separator --- Lambda3 Third wavelength 0.1nm Ident Identification --- Notes Notes --- Ref References number=1 1: Torre-Dodgen & Weaver (1993) <III/181> 2: Kirkpatrick et al. (1991ApJS...77..417K) --- James Marcout, Patricia Bauer CDS 1996Oct01 UNKNOWN UNKNOWN Prepared via OCR at CDS. J_AJ_109_1379.xml