The Clusters AgeS Experiment (CASE): The Blue Straggler Star M55-V60 Caught Amidst Rapid Mass Exchange

• Autorzy: Rozyczka M. , Kaluzny J. , Thompson I. B. , Rucinski S. M. , Pych W. , Krzeminski W.
• Języki publikacji: EN

Abstrakty

EN

We analyze light and velocity curves of the eclipsing blue straggler V60 in the field of the globular cluster M55. We derive M_p=1.259± 0.025 M_sun, R_p=1.102±0.021 R_sun, M ^bol_p=3.03±0.09 mag for the primary and Ms=0.327±0.017 M_sun, R_s=1.480±0.011 R_sun, M^bol_s=4.18±0.12 mag for the secondary. We measure an apparent distance modulus (m-M)_V=14.04±0.09 mag. Based on the systemic velocity, distance, and proper motion of V60 we conclude that the system is a member of the cluster and argue that its present state is a result of rapid but conservative mass exchange which the binary is still undergoing. We report a peculiar blue excess on the ascending branch of the primary eclipse of V60 and discuss its possible origin.

Słowa kluczowe

EN

globular clusters: individual: M55; blue stragglers; stars: individual: M55-V60

• Wydawca: Copernicus Foundation for Polish Astronomy
• Czasopismo: Acta Astronomica
• Rocznik: 2013
• Tom: Vol. 63, No. 1
• Strony: 67--78
• Opis fizyczny: Bibliogr. 23 poz., rys., tab., wykr.

Twórcy

autor

Rozyczka M.

• Nicolaus Copernicus Astronomical Center, ul. Bartycka 18, 00-716 Warsaw, Poland

autor

Kaluzny J.

• Nicolaus Copernicus Astronomical Center, ul. Bartycka 18, 00-716 Warsaw, Poland

autor

Thompson I. B.

• he Observatories of the Carnegie Institution of Washington, 813 Santa Barbara Street, Pasadena, CA 91101, USA

autor

Rucinski S. M.

• Department of Astronomy and Astrophysics, University of Toronto, 50 St. George Street, Toronto, ON M5S 3H4, Canada

autor

Pych W.

• Nicolaus Copernicus Astronomical Center, ul. Bartycka 18, 00-716 Warsaw, Poland

autor

Krzeminski W.

• Nicolaus Copernicus Astronomical Center, ul. Bartycka 18, 00-716 Warsaw, Poland

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