The macho project LMC variable star inventory. VI. The second overtone mode of Cepheid pulsation from first/second overtone beat Cepheids

被引：37

作者：

Alcock, C ^{[1
]}

Allsman, RA

Alves, D

Axelrod, TS

Becker, AC

Bennett, DP

Cook, KH

Freeman, KC

Griest, K

Lehner, MJ

Marshall, SL

Minniti, D

Peterson, BA

Pratt, MR

Quinn, PJ

Rodgers, AW

Rorabeck, A

Sutherland, W

Tomaney, A

Vandehei, T

Welch, DL

机构：

[1] Univ Calif Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

[2] Univ Calif Berkeley, Ctr Particle Astrophys, Berkeley, CA 94720 USA

[3] Australian Natl Univ, Supercomp Facil, Canberra, ACT 0200, Australia

[4] Univ Calif Davis, Dept Phys, Davis, CA 95616 USA

[5] Australian Natl Univ, Mt Stromlo & Siding Spring Observ, Weston, ACT 2611, Australia

[6] Univ Washington, Dept Astron, Seattle, WA 98195 USA

[7] Univ Washington, Dept Phys, Seattle, WA 98195 USA

[8] Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA

[9] Univ Sheffield, Dept Phys, Sheffield S3 7RH, S Yorkshire, England

[10] MIT, LIGO Project, Cambridge, MA 02139 USA

[11] European So Observ, D-85748 Garching, Germany

[12] McMaster Univ, Dept Phys & Astron, Hamilton, ON L8S 4M1, Canada

[13] Univ Oxford, Dept Phys, Oxford OX1 3RH, England

来源：

ASTROPHYSICAL JOURNAL | 1999年 / 511卷 / 01期

关键词：

Cepheids; Magellanic Clouds; stars : fundamental parameters; stars : oscillations;

D O I：

10.1086/306638

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

MACHO Project photometry of 45 LMC first and second overtone (FO and SO, respectively) beat Cepheids that pulsate in the FO and SO has been analyzed to determine the light-curve characteristics for the SO mode of Cepheid pulsation. We predict that singly periodic SO Cepheids will have nearly sinusoidal light curves; that we will only be able to discern SO Cepheids from fundamental (F) and FO Cepheids for P less than or similar to 1.4 days; and that the SO distribution will overlap the short-period edge of the LMC FO Cepheid period-luminosity relation (when both are plotted as a function of photometric period). We also report the discovery of one SO Cepheid candidate, MACHO*05:03 :39.6-70:04:32, with a photometric period of 0.775961 +/- 0.000019 days and an instrumental amplitude of 0.047 +/- 0.009 mag in V.

引用

页码：185 / 192

页数：8