Space Reddenings For Fifteen Galactic Cepheids

 

D. G. Turner,¹ R. F. MacLellan,² A. A. Henden,³ and L. N. Berdnikov⁴

 

¹ Department of Astronomy and Physics, Saint Mary's University, Halifax, Nova Scotia, B3H 3C3, Canada (turner@ap.smu.ca).

² Department of Physics and Engineering Physics, Queen's University, Kingston, ON K7L 3N6 Canada (rmaclellan@bama.ua.edu).

³ American Association of Variable Star Observers, 49 Bay State Road, Cambridge, MA 02138, U.S.A. (arne@aavso.org).

⁴ Sternberg Astronomical Institute, 13 Universitetskij prosp., Moscow 119992, Russia (leonid.berdnikov@gmail.com).

 

Received 2011 February 24
Accepted 2011 June 27

 

RESUMEN

Derivamos enrojecimientos espaciales para 15 Cefeidas galácticas a partir de datos CCD BV(RI)c desenrojecidos para estrellas tipo AF en las vecindades inmediatas de esas variables, en conjunción con enrojecimientos 2MASS de estrellas tipo BAF en los mismos campos. Analizamos las soluciones potenciales de enrojecimiento utilizando el método de extinción variable para identificar estrellas con distancias y enrojecimientos similares a las de las Cefeidas, muchas de las cuales presentan excesos de color. Hemos modificado ligeramente la relación de color intrínseco BV(RI)c para enanas AF en nuestro análisis, de tal forma que los colores observados para estrellas no enrojecidas en la muestra queden descritos de forma apropiada.

 

ABSTRACT

Space reddenings are derived for 15 Galactic Cepheids from dereddening CCD BV(RI)c data for AF–type stars in the immediate vicinities of the variables, in conjunction with 2MASS reddenings for BAF–type stars in the same fields. Potential reddening solutions were analyzed using the variable–extinction method to identify stars sharing potentially similar distances and reddenings to the Cepheids, several of which have large color excesses. The intrinsic BV(RI)_c color relation for AF dwarfs was modified slightly in the analysis in order to describe better the colors observed for unreddened stars in the samples.

Key Words: methods: observational — stars: variable: Cepheids — ISM: dust, extinction.

 

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ACKNOWLEDGMENTS

The present study was supported in part by research funding awarded through the Natural Sciences and Engineering Research Council of Canada (NSERC), through the Russian Foundation for Basic Research (RFBR), and through the program of Support for Leading Scientific Schools of Russia. This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation.

 

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