Sakurai's object (V4334 Sgr) in 1998: The R CrB phase has set in

Details Sakurai's object (V4334 Sgr) in 1998: The R CrB phase has set in Sakurai's object (V4334 Sgr) in 1998: The R CrB phase has set in

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999astl...25..615a&link_type=abstract

Astronomy Letters, Volume 25, Issue 9, September 1999, pp.615-623

Astronomy and Astrophysics

Astronomy

9

Scientific paper

Photometric BVRI observations of V4334 Sgr during 43 nights in 1998 are presented. They show that the star has entered the R CrB phase. Three deep minima with amplitudes between 1 mag and 7 mag in V were observed in 1998. The change in B-V, V-R, and V-I reflected mainly the reddening in the circumstellar envelope and, possibly, further cooling of the star. The previously observed light variations are found to be described by a systematic increase of the only pulsation period from 9 to 40 days in late 1997 and, possibly, to 60 days in late 1998. By the C_2 and CN absorption bands and the NaI lines, in 1998 the star is classified as C-J4 C25 j5 in Keenan's revised system. The continuum energy distribution in the wavelength range 4500-7500 A in late April 1998 is fitted by the spectral energy distribution of a G5 Ib supergiant. The extinction law in the circumstellar dust envelope of V4334 Sgr is shown to essentially match the interstellar extinction law at optical wavelengths. The luminosity of the star in 1996-1997 was constant if its effective temperature corresponded to the scale of normal supergiants and if the interstellar reddening is assumed to be E(B-V) = 0.8.

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