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Title:
Fundamental parameters and evolutionary state of the Herbig Ae star candidate HD 35929
Authors:
Miroshnichenko, A. S.; Gray, R. O.; Klochkova, V. G.; Bjorkman, K. S.; Kuratov, K. S.
Affiliation:
AA(Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany ; Ritter Observatory, Department of Physics and Astronomy, The University of Toledo, Toledo, OH 43606-3390, USA; Pulkovo Observatory, Saint-Petersburg, 196140, Russia ), AB(Department of Physics and Astronomy, Appalachian State University, Boone, NC 28608, USA), AC(Special Astrophysical Observatory of the Russian Academy of Sciences, Karachai-Cirkassian Republic, Nizhnij Arkhyz, 369167, Russia; Isaac Newton Institute of Chile, SAO Branch, Russia), AD(Ritter Observatory, Department of Physics and Astronomy, The University of Toledo, Toledo, OH 43606-3390, USA), AE(Fesenkov Astrophysical Institute, Almaty 480068, Kazakhstan)
Publication:
Astronomy and Astrophysics, v.427, p.937-944 (2004) (A&A Homepage)
Publication Date:
12/2004
Origin:
A&A
Astronomy Keywords:
techniques: spectroscopic, techniques: photometric, stars: circumstellar matter, stars: individual: HD 35929
DOI:
10.1051/0004-6361:20041618
Bibliographic Code:
2004A&A...427..937M

Abstract

HD 35929 is a pre-main-sequence Herbig Ae star candidate that exhibits emission in the Hα line and a weak IR excess. Although its luminosity type was estimated as IV from low-resolution spectroscopy, the insignificant HIPPARCOS parallax (0.88±0.93 mas) contradicted the low luminosity. To resolve this discrepancy, we took 3 high-resolution optical spectra of the star (region 5200-6915 Å, R ˜60 000) and used an archival one (4000-6800 Å, R ˜48 000). Our analysis of the spectral and photometric information shows that HD 35929 is an F2 III star with Teff=6880±100 K, log g = 3.3±0.1, log L/Lsun=1.7±0.2, v sin i =70±5 km s-1, M=2.3±0.2 Msun, a mild metal deficit [Fe/H]=-0.2±0.1, and a weak interstellar reddening (AV ˜0.1 mag) at a distance D = 345±60 pc. These results confirm an earlier suggestion by Marconi et al. (\cite{marc00}) that HD 35929 is located within the instability strip. At the same time, we argue that it is not a young object, but rather a post-main-sequence giant. The fundamental parameters and IR excess of HD 35929 are similar to those of HD 19993, an emission-line late A-type giant recently discovered by us (Miroshnichenko et al. \cite{mir03}). These objects might represent a group of evolved intermediate-mass stars with an enhanced mass loss.
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