Variable Stars in M13. II. The Red Variables and the Globular Cluster Period-Luminosity Relation

• Autorzy: Osborn W. , Layden A. , Kopacki G. , Smith H. , Anderson M. , Kelly A. , McBride K. , Pritzl B.

Identyfikatory

DOI

10.32023/0001-5237/67.2.3

• Języki publikacji: EN

Abstrakty

EN

New CCD observations have been combined with archival data to investigate the nature of the red variables in the globular cluster M13. Mean magnitudes, colors and variation ranges on the UBVI_C system have been determined for the 17 cataloged red variables. 15 of the stars are irregular or semi-regular variables that lie at the top of the red giant branch in the color-magnitude diagram. Two stars are not, including one with a well-defined period and a light curve shape indicating it is an ellipsoidal or eclipsing variable. All stars redder than (V-I_C)₀=1.38 mag vary, with the amplitudes being larger with increased stellar luminosity and with bluer filter passband. Searches of the data for periodicities yielded typical variability cycle times ranging from 30 d up to 92 d for the most luminous star. Several stars have evidence of multiple periods. The stars' period-luminosity diagram compared to those from microlensing survey data shows that most M13 red variables are overtone pulsators. Comparison with the diagrams for other globular clusters shows a correlation between red variable luminosity and cluster metallicity.

Słowa kluczowe

EN

globular clusters: individual: M13; stars: late-type; stars: AGB; stars: post-AGB

• Wydawca: Copernicus Foundation for Polish Astronomy
• Czasopismo: Acta Astronomica
• Rocznik: 2017
• Tom: Vol. 67, No. 2
• Strony: 131--158
• Opis fizyczny: Bibliogr. 80 poz., rys,. tab., wykr.

Twórcy

autor

Osborn W.

• Yerkes Observatory, 373 West Geneva Street, Williams Bay, WI 53191, USA
• Dept. of Physics, Central Michigan Univ., Mount Pleasant, MI 48859, USA

autor

Layden A.

• Dept. of Physics & Astronomy, Bowling Green State Univ., Bowling Green, OH 43043, USA

autor

Kopacki G.

• Instytut Astronomiczny, Uniwersytet Wrocławski, ul. Kopernika 11, 51-622 Wrocław, Poland

autor

Smith H.

• Dept. of Physics & Astronomy, Michigan State Univ., East Lansing, MI 48824, USA

autor

Anderson M.

• Dept. of Physics & Astronomy, Michigan State Univ., East Lansing, MI 48824, USA

autor

Kelly A.

• Dept. of Physics & Astronomy, Bowling Green State Univ., Bowling Green, OH 43043, USA

autor

McBride K.

• Dept. of Physics & Astronomy, Bowling Green State Univ., Bowling Green, OH 43043, USA

autor

Pritzl B.

• Physics & Astronomy Dept., Univ. of Wisconsin Oshkosh, Oshkosh WI 54901, USA

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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).