Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...202...77r&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 202, no. 1-2, Aug. 1988, p. 77-80.
Astronomy and Astrophysics
Astrophysics
31
Galactic Clusters, Stellar Evolution, White Dwarf Stars, Blue Stars, Main Sequence Stars, Spectral Line Width, Stellar Magnitude, Stellar Spectrophotometry
Scientific paper
The authors have performed spectroscopic observations of 3 faint blue objects located in the field of the intermediate age galactic cluster NGC 2168 and proposed by Romanishin and Angel (1981) as white dwarf candidates. NGC 2168-3 and -4 are very hot white dwarfs with Teff = 37,500K and 44,000K, respectively. NGC 2168-1 is much fainter (V ≈ 21.5) and cooler (9500K) and cannot be a cluster member according to its distance and cooling age. A fourth WD candidate (2168-2) could not be observed spectroscopically due to its faintness (V ⪆ 22) and is probably not a hot cluster member. Depending on the assumed value for reddening, the masses of NGC 2168-3 and -4 are between 0.6 and 0.8 M_sun;. The results for NGC 2168 are compared with those for NGC 2516, a cluster with nearly the same age and turnoff-mass (≡5 M_sun;) where the three WD members have smaller radii and somewhat higher masses of ⪆1 M_sun; (Reimers and Koester, 1982).
Koester Detlev
Reimers Dieter
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