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Issue A&A
Volume 377, Number 3, October III 2001
Page(s) 854 - 867
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20010958



A&A 377, 854-867 (2001)
DOI: 10.1051/0004-6361:20010958

The pre-main-sequence star IP Persei

A. S. Miroshnichenko1, 2, K. S. Bjorkman1, E. L. Chentsov3, 4, V. G. Klochkova3, 4, R. O. Gray5, P. García-Lario6 and J. V. Perea Calderón7

1  Ritter Observatory, Dept. of Physics & Astronomy, University of Toledo, Toledo, OH 43606-3390, USA
2  Central Astronomical Observatory of the Russian Academy of Sciences at Pulkovo, 196140, Saint-Petersburg, Russia
3  Special Astrophysical Observatory of the Russian Academy of Sciences, Karachai-Cirkassian Republic, Nizhnij Arkhyz, 369167, Russia
4  Issac Newton Institute of Chile, SAO Branch, Russia
5  Dept. of Physics and Astronomy, Appalachian State University, Boone, NC 28608, USA
6  ISO Data Centre, Astrophysics Division, Space Science Department of ESA, Villafranca del Castillo, Apartado de Correos 50727, 28080 Madrid, Spain
7  INSA SA, Villafranca del Castillo, Apartado de Correos 50727, 28080 Madrid, Spain

(Received 19 March 2001 / Accepted 21 June 2001 )

Abstract
We present the results of high- and low-resolution spectroscopic and broadband multicolour photometric observations of the emission-line A-type star IP Per. Significant variations of the Balmer line profiles and near-IR brightness are detected. Comparison with the spectra of other stars and theoretical models allowed us to derive its fundamental parameters as follows: $T_{\rm eff} \simeq$ 8000 K, log $g \simeq$ 4.4, $\log L_{\rm bol}/L_{\odot} \simeq 1.0$. They correspond to the MK type A7 V. We also found that the metallicity of the object's atmosphere is nearly 40 per cent that of the Sun. Our result for the star's gravity implies that it is located at the zero-age main-sequence. We conclude that IP Per is a pre-main-sequence Herbig Ae star, and belongs to the group of UX Ori-type stars showing irregular photometric minima. A recent result by Kovalchuk & Pugach (1997), that IP Per is an evolved high-luminosity star, is not confirmed. The discrepancy in the log g determination, which led to the difference in the luminosity, seems to be due to uncertainties in the échelle data reduction for broad lines and a different estimate for the star's temperature.


Key words: stars: emission-line -- stars: pre-main-sequence -- stars: individual IP Per -- techniques: spectroscopic, techniques photometric

Offprint request: A. S. Miroshnichenko, anatoly@physics.utoledo.edu

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© ESO 2001


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