On the anomaly of Balmer line profiles of A-type stars. Fundamental binary systems

Details On the anomaly of Balmer line profiles of A-type stars. Fundamental binary systems On the anomaly of Balmer line profiles of A-type stars. Fundamental binary systems

2002-09-12

arxiv.org/abs/astro-ph/0209239v1

Astron.Astrophys. 395 (2002) 601-610

Astronomy and Astrophysics

Astrophysics

10 pages, 4 figures; Accepted by A&A

Scientific paper

10.1051/0004-6361:20021330

In previous work, Gardiner et al. (1999) found evidence for a discrepancy between the Teff obtained from Balmer lines with that from photometry and fundamental values for A-type stars. An investigation into this anomaly is presented using Balmer line profiles of stars in binary system with fundamental values of both Teff and log g. A revision of the fundamental parameters for binary systems given by Smalley & Dworetsky (1995) is also presented. The Teff obtained by fitting Halpha and Hbeta line profiles is compared to the fundamental values and those obtained from uvby photometry. We find that the discrepancy found by Gardiner et al. (1999) for stars in the range 7000 K < Teff < 9000 K is no longer evident.

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