OPTICAL PHOTOMETRY OF THE ECLIPSING LARGE MAGELLANIC CLOUD SUPERSOFT SOURCE-CAL87

Authors
ALCOCK C ALLSMAN RA ALVES DR AXELROD TS BENNETT DP CHARLES PA COOK KH ODONOGHUE D FREEMAN KC GRIEST K GUERN J LEHNER MJ LIVIO M MARSHALL SL MINNITI D PETERSON BA PRATT MR QUINN PJ RODGERS AW SOUTHWELL KA STUBBS CW SUTHERLAND W WELCH DL
Citation
C. Alcock et al., OPTICAL PHOTOMETRY OF THE ECLIPSING LARGE MAGELLANIC CLOUD SUPERSOFT SOURCE-CAL87, Monthly Notices of the Royal Astronomical Society, 287(3), 1997, pp. 699-704
Citations number
31
Categorie Soggetti
Astronomy & Astrophysics
Journal title
Monthly Notices of the Royal Astronomical Society → ACNP
ISSN journal
00358711
Volume
287
Issue
3
Year of publication
1997
Pages
699 - 704
Database
ISI
SICI code
0035-8711(1997)287:3<699:OPOTEL>2.0.ZU;2-G
Abstract
We present optical photometry of the eclipsing supersoft source CAL 87 . These observations comprise long-term data accumulated as a by-produ ct of the MACHO Project, and high-speed, white-light photometry of a s ingle eclipse. We (i) derive an improved ephemeris of T-0 = HJD 245 01 11.5144(3) + 0.442 677 14(6)E for the time of minimum light, (ii) find the eclipse structure to be stable over a period of similar to 4 yr, and (iii) investigate the colour variation as a function of orbital ph ase. The resolution afforded by the high-speed nature of the white-lig ht observations enables us to see new structure in the light-curve mor phology.