Kolbas, V and Pavlovski, K and Southworth, J and Lee, C-U and Lee, D-J and Lee, JW and Kim, S-L and Kim, H-I and Smalley, B and Tkachenko, A (2015) Spectroscopically resolving the Algol triple system. Monthly Notices of the Royal Astronomical Society, 451 (4). 4150 -4161. ISSN 1365-2966

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Abstract

Algol (β Persei) is the prototypical semidetached eclipsing binary and a hierarchical triple system. From 2006 to 2010 we obtained 121 high-resolution and high signal-to-noise ratio echelle spectra of this object. Spectral disentangling yields the individual spectra of all three stars, and greatly improved elements both the inner and outer orbits. We find masses of
MA = 3.39 ± 0.06 M, MB = 0.770 ± 0.009 M and MC = 1.58 ± 0.09 M. The disentangled spectra also give the light ratios between the components in the B and V bands. Atmospheric parameters for the three stars are determined, including detailed elemental abundances for Algol A and Algol C. We find the following effective temperatures: TA = 12 550 ± 120 K, TB = 4900 ± 300 K and TC = 7550 ± 250 K. The projected rotational velocities are vAsin iA = 50.8 ± 0.8 km s−1, vBsin iB = 62 ± 2 km s−1 and vCsin iC = 12.4 ± 0.6 km s−1. This is the first measurement of the rotational velocity for Algol B, and confirms that it is synchronous with the orbital motion. The abundance patterns of components A and C are identical to within the measurement errors, and are basically solar. They can be summarized as mean metal abundances: [M/H]A = −0.03 ± 0.08 and [M/H]C = 0.04 ± 0.09. A carbon deficiency is confirmed for Algol A, with tentative indications for a slight overabundance of nitrogen. The ratio of their abundances is (C/N)A = 2.0 ± 0.4, half of the solar value of (C/N) = 4.0 ± 0.7. The new results derived in this study, including detailed abundances and metallicities, will enable tight constraints on theoretical evolutionary models for this complex system.

Item Type: Article
Additional Information: This article has been accepted for publication in the Monthly Notices of the Royal Astronomical Society © 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: binaries, eclipsing, binaries, spectroscopic, stars, fundamental parameters, individual, Algol
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Natural Sciences > School of Physical and Geographical Sciences
Related URLs:
Depositing User: Symplectic
Date Deposited: 11 Nov 2015 10:53
Last Modified: 19 Sep 2017 11:04
URI: http://eprints.keele.ac.uk/id/eprint/1133

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