Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...195.3706k&link_type=abstract
American Astronomical Society, 195th AAS Meeting, #37.06; Bulletin of the American Astronomical Society, Vol. 31, p.1422
Astronomy and Astrophysics
Astronomy
Scientific paper
Before the 1960s, the X-rays from soft X-ray transients (SXTs) were never detected, since there were no spacecraft. SXT outbursts are thought to be dwarf nova outbursts in black hole binaries. Since, in the visual, SXT outbursts have amplitudes exceeding 10 magnitudes and durations of many weeks, they may have been mistaken for classical novae. V404 Cygni was: it was originally known as Nova Cygni 1938. We report time-resolved photometry from the 0.92-m SARA telescope to search for ellipsoidal variations in the old novae FS Sct (1952) and V606 Aql (1899). Since we expect black holes to be more massive than white dwarfs, we expect these ellipsoidal variations to tell whether these are black hole systems or old novae. We find a possible variation in FS Sct, although more cycles are needed to confirm it. We also find that for V606 Aql, neither candidate star 1 nor 2 of Duerbeck (1987) flicker, as old novae or SXTs do. Is this nova lost, or perhaps hibernating? This work was funded by the NSF through the SARA Research Experiences for Undergraduates Summer Internship Program (NSF AST--9619939).
Knez Claudia
Ringwald Fred A.
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