On the nature of the candidate T-Tauri star V501 Aurigae{starf}
| Autor: | Emil Kundra, K. N. Grankin, J. M. Ohlert, Lars A. Buchhave, S. Yu. Shugarov, C. Marka, R. Komžík, Markus Mugrauer, Ch. Ginski, Štefan Parimucha, Guillermo Torres, Martin Vaňko, Jan Budaj, Theodor Pribulla, V. Perdelwitz, V. Krushevska, L. Hambálek, Z. Garai, Ralph Neuhäuser, P. Dubovský, Raetz |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Rotation period
Physics 010308 nuclear & particles physics FOS: Physical sciences Astronomy Astronomy and Astrophysics Orbital eccentricity individual: V501 Aur [stars] Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Orbital period Surface gravity 01 natural sciences Photometry (optics) T Tauri star Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics Binary system 010303 astronomy & astrophysics Stellar evolution Solar and Stellar Astrophysics (astro-ph.SR) Astrophysics::Galaxy Astrophysics |
| Zdroj: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (ISSN 0035-8711), 467(4), 4902-4913 Vaňko, M, Torres, G, Hambálek, L, Pribulla, T, Buchhave, L A, Budaj, J, Dubovský, P, Garai, Z, Ginski, C, Grankin, K, Komžík, R, Krushevska, V, Kundra, E, Marka, C, Mugrauer, M, Neuhäuser, R, Ohlert, J, Parimucha, Š, Perdelwitz, V, Raetz, S & Shugarov, S Y 2017, ' On the nature of the candidate T-Tauri star V501 Aurigae ', Royal Astronomical Society. Monthly Notices, vol. 467, no. 4, pp. 4902-4913 . https://doi.org/10.1093/mnras/stx407 |
| Popis: | We report new multi-colour photometry and high-resolution spectroscopic observations of the long-period variable V501 Aur, previously considered to be a weak-lined T-Tauri star belonging to the Taurus-Auriga star-forming region. The spectroscopic observations reveal that V501 Aur is a single-lined spectroscopic binary system with a 68.8-day orbital period, a slightly eccentric orbit (e ~ 0.03), and a systemic velocity discrepant from the mean of Taurus-Auriga. The photometry shows quasi-periodic variations on a different, ~55-day timescale that we attribute to rotational modulation by spots. No eclipses are seen. The visible object is a rapidly rotating (vsini ~ 25 km/s) early K star, which along with the rotation period implies it must be large (R > 26.3 Rsun), as suggested also by spectroscopic estimates indicating a low surface gravity. The parallax from the Gaia mission and other independent estimates imply a distance much greater than the Taurus-Auriga region, consistent with the giant interpretation. Taken together, this evidence together with a re-evaluation of the LiI~$\lambda$6707 and H$\alpha$ lines shows that V501 Aur is not a T-Tauri star, but is instead a field binary with a giant primary far behind the Taurus-Auriga star-forming region. The large mass function from the spectroscopic orbit and a comparison with stellar evolution models suggest the secondary may be an early-type main-sequence star. Comment: 13 pages, 7 figures. Accepted to MNRAS |
| Databáze: | OpenAIRE |
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