R CORONAE BOREALIS STARS IN M31 FROM THE PALOMAR TRANSIENT FACTORY

被引：6

作者：

Tang, Sumin ^{[1
,2
]}

Cao, Yi ^{[2
]}

Bildsten, Lars ^{[1
]}

Nugent, Peter ^{[3
,4
]}

Bellm, Eric ^{[2
]}

Kulkarni, Shrinivas R. ^{[2
]}

Laher, Russ ^{[5
]}

Levitan, David ^{[2
]}

Masci, Frank ^{[6
]}

Ofek, Eran O. ^{[7
,8
]}

Prince, Thomas A. ^{[2
]}

Sesar, Branimir ^{[2
]}

Surace, Jason ^{[5
]}

机构：

[1] Univ Calif Santa Barbara, Kavli Inst Theoret Phys, Santa Barbara, CA 93106 USA

[2] CALTECH, Div Phys Math & Astron, Pasadena, CA 91125 USA

[3] Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Computat Cosmol Ctr, Berkeley, CA 94720 USA

[4] Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA

[5] CALTECH, Spitzer Sci Ctr, Pasadena, CA 91125 USA

[6] CALTECH, Infrared Proc & Anal Ctr, Pasadena, CA 91125 USA

[7] Weizmann Inst Sci, Benoziyo Ctr Astrophys, IL-76100 Rehovot, Israel

[8] Weizmann Inst Sci, Helen Kimmel Ctr Planetary Sci, IL-76100 Rehovot, Israel

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2013年 / 767卷 / 02期

基金：

美国国家科学基金会;

关键词：

galaxies: individual (M31); stars: AGB and post-AGB; stars: carbon; stars: variables: general; supergiants; HYDROGEN-DEFICIENT CARBON; WHITE-DWARF MERGERS; SPECTROSCOPIC SURVEY; MAGELLANIC-CLOUD; SPECTROGRAPH; TELESCOPE; BINARIES; PIPELINE; O-18;

D O I：

10.1088/2041-8205/767/2/L23

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the discovery of R Coronae Borealis (RCB) stars in the Andromeda galaxy (M31) using the Palomar Transient Factory (PTF). RCB stars are rare hydrogen-deficient, carbon-rich supergiant variables, most likely the merger products of two white dwarfs. These new RCBs, including two confirmed ones and two candidates, are the first to be found beyond the Milky Way and the Magellanic Clouds. All of M31 RCBs showed > 1.5 mag irregular declines over timescales of weeks to months. Due to the limiting magnitude of our data (R approximate to 21-22 mag), these RCB stars have R approximate to 19.5-20.5 mag at maximum light, corresponding to M-R = -4 to -5, making them some of the most luminous RCBs known. Spectra of two objects show that they are warm RCBs, similar to the Milky Way RCBs RY Sgr and V854 Cen. We consider these results, derived from a pilot study of M31 variables, as an important proof-of-concept for the study of rare bright variables in nearby galaxies with the PTF or other synoptic surveys.

引用

页数：5

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