SIMBAD references

2013A&A...551A..31D - Astronomy and Astrophysics, volume 551A, 31-31 (2013/3-1)

An MK-like system of spectral classification for hot subdwarfs.

DRILLING J.S., JEFFERY C.S., HEBER U., MOEHLER S. and NAPIWOTZKI R.

Abstract (from CDS):

An MK (Morgan-Keenan)-like system of spectral classification for hot subdwarfs is presented. We find that a three-dimensional spectral type, consisting of a ``spectral'' class, a ``luminosity'' class, and a ``helium'' class, is necessary to classify the sdO (subdwarf O) and sdB (subdwarf B) stars. In addition, the helium-strong stars appear to form two parallel spectral sequences: one showing strong lines of CII, CIII, or CIV, and the other with these same lines weak or absent. We also give a preliminary calibration of the new spectral types in terms of effective temperature, surface gravity, and surface helium-to-hydrogen abundance ratio, and show the relation between the new spectral types and the natural groups defined by the Palomar-Green (PG) survey.

Abstract Copyright:

Journal keyword(s): stars: early-type - subdwarfs - stars: atmospheres

VizieR on-line data: <Available at CDS (J/A+A/551/A31): table2.dat index.dat spectrum/*>

CDS comments: Table 2: PG1433+240 is PG1433+239 in Simbad.

Simbad objects: 182

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2021.06.19-06:16:11

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