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The Spitzer IRS view of V4334 Sgr (Sakurai's Object)
A. Evans, V. H. Tyne, J. Th. van Loon +11
We present an observation of the very late thermal pulse object V4334 Sgr (Sakurai's Object) with the Infrared Spectrometer (IRS) on the Spitzer Space Telescope. The emission from…
Eclipsing binaries in open clusters. III. V621 Per in chi Persei
J. Southworth, S. Zucker, P. F. L. Maxted +1
V621 Persei is a detached eclipsing binary in the open cluster chi Persei which is composed of an early B-type giant star and a main sequence secondary component. From high-resolut…
The ASTRA Spectrophotometer: A July 2004 Progress Report
S. J. Adelman, A. F. Gulliver, B. Smalley +4
A cross-dispersed spectrophotometer with CCD detector and its automated 0.5-m telescope at the Fairborn Observatory, now under construction, should begin observations in 6 to 9 mon…
Accurate fundamental parameters of eclipsing binary stars
J. Southworth, B. Smalley, P. F. L. Maxted +1
The study of detached eclipsing binaries is one of the most powerful ways to investigate the properties of individual stars and stellar systems. We present preliminary masses, radi…
Eclipsing binaries in open clusters. II. V453 Cyg in NGC 6871
J. Southworth, P. F. L. Maxted, B. Smalley
We derive absolute dimensions of the early B-type detached eclipsing binary V453 Cygni (B0.4 IV + B0.7 IV, P=3.89d), a member of the open cluster NGC 6871. From the analysis of new…
Eclipsing binaries in open clusters. I. V615 Per and V618 Per in h Per
J. Southworth, P. F. L. Maxted, B. Smalley
We derive absolute dimensions for two early-type main sequence detached eclipsing binaries in the young open cluster h Persei (NGC 869). V615 Persei has a spectral type of B7V and…
On the anomaly of Balmer line profiles of A-type stars. Fundamental binary systems
B. Smalley, R. B. Gardiner, F. Kupka +1
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 st…
Lithium 6104A in Population II stars
A. Ford, R. D. Jeffries, B. Smalley +5
We have obtained echelle spectroscopy of 14 Population II objects selected from those previously observed by Bonifacio & Molaro (1997). For one object, HD 140283, we obtained exqui…
Using Balmer line profiles to investigate convection in A and F stars
B. Smalley, F. Kupka
Balmer lines are an important diagnostic of stellar atmospheric structure, since they are formed at a wide range of depths within the atmosphere. The different Balmer lines are for…