Photometric analysis of Magellanic Cloud R Coronae Borealis Stars in the recovery phase of their declines

Details Photometric analysis of Magellanic Cloud R Coronae Borealis Stars in the recovery phase of their declines Photometric analysis of Magellanic Cloud R Coronae Borealis Stars in the recovery phase of their declines

2009-02-07

arxiv.org/abs/0902.1212v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

accepted for publication in the Publications of the Astronomical Society of Australia

Scientific paper

10.1071/AS08028

This paper presents the initial results of a multi-site photometric programme to examine the extraordinary behaviour displayed by 18 R Coronae Borealis (RCB) stars in the Magellanic Clouds (MCs). RCB stars exhibit a unique variability whereby they undergo rapid declines of up to several magnitudes. These are thought to be caused by the formation of dust in the stellar environment which reduces the brightness. The monitoring programme comprised the collection of UBVRI photometric data using five telescopes located at three different southern hemisphere longitudes (Las Campanas Observatory in Chile, Mount Joun University Observatory in New Zealand, and the Southern African Large Telescope (SALT) in South Africa). Examination of the data acquired in the V and I filters resulted in the identification of a total of 18 RCB declines occurring in four stars. Construction of colour-magnitude diagrams (V vs V-I), during the recovery to maximum light were undertaken in order to study the unique colour behaviour associated with the RCB declines. The combined recovery slope for the four stars was determined to be 3.37+/-0.24, which is similar to the value of 3.1+/-0.1 calculated for galactic RCB stars (Skuljan et al. 2003). These results may imply that the nature of the dust (i.e. the particle size) is similar in both our Galaxy and the MCs.

Affiliated with

Also associated with

No associations

Rating

Photometric analysis of Magellanic Cloud R Coronae Borealis Stars in the recovery phase of their declines does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Photometric analysis of Magellanic Cloud R Coronae Borealis Stars in the recovery phase of their declines, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Photometric analysis of Magellanic Cloud R Coronae Borealis Stars in the recovery phase of their declines will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-311902