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V499 Ara

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pukemaru
pukemaru's picture
V499 Ara

This is another one I want to query. There has been ONE positive visual observation at 17.8 in March 2004. There have been 439 observations since we first started observing around 1998. The range is 14.8–<16.2p. Most negative observations are between 150-155 and you would think at least some outbursts would have been recorded during this time frame.

Can anyone shged any more light on this star?

Thanks

Stephen [HSP]

Mati
Mati's picture
V499 Ara

Re V499 Ara. This object is classified as a DN, or even DN SU, but verification is very thin. One outburst was observed on JD 2436781 = 1959 July 31, by Hoffmeister (1963). His remark, that only one maximum was observed, is repeated by Khruzhina and Shugarov (1991) in their atlas. No spectroscopic confirmation. V499 Ara was on the target list of FUSE (Far Ultra Violet Spectroscopic Explorer) with the result either negative, or inconclusive. They make the remark : "No evidence of a (far-UV) source in any channel". Visit http://archive.stsci/prepds/fuse_cv/ Most of the spectral trace is just noise (I think).

Ref: Khruzina, T.S. and Shugarov, S. Yu. 1991 "Atlas of Cataclysmic Variables. U Geminorum Stars."

Mati

pukemaru
pukemaru's picture
V499 Ara

Thanks, Mati. Now the remark,
"No evidence of a (far-UV) source in any channel". Visit http://archive.stsci/prepds/fuse_cv/ Most of the spectral trace is just noise (I think)."...
Does that mean it doesn't exist? Should I keep observing?

Stephen [HSP]

Mati
Mati's picture
Re V499 Ara

There appears to be no doubt as to the identity of Hoffmeister's star.

USNO-B1.0 and USNO-A2.0 both yield a visual mag. of 17.7 for the star (the same star as listed in VSX). But, it seems that it doesn't have the right spectral signature for a UG star. The range being about 3.0 mag., yet regular outbursts are lacking. A conundrum indeed. I suppose it becomes an individual decision, as to whether you give other targets a higher priority, yet with your particular instrument you are more capable of keeping an eye on it. Depends on whether you feel happy following a "do-nothing" star.

Mati

pukemaru
pukemaru's picture
V499 Ara

I watched GR ORI for quite a few years as a do nothing star, Mati, and lo and behold, one day, it was there. :-) I'll observe when the new telescope comes.

Thanks so much for your comments and information.

Stephen [HSP]

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