Affiliation
Royal Astronomical Society of New Zealand, Variable Star Section (RASNZ-VSS)
Tue, 10/16/2018 - 09:23
This star is brightening after an almost 3 year minimum. I recorded it last night 20181015.537 at 16.2. Very faint but definitely visible.
Stephen Hovell [HSP]
New Zealand
Hi Stephen,
I could take it up in my observing schedule if of interest. I could do BVI exposures like I did for V348 Sgr.
Josch
Hi Josch.
I'm not sure, but it is still an NSV. I guess if there was more data it could eventually gain a 'regular' name.
Stephen
Ok will take images for a while and then see. Have been recently at a conference on hydrogen deficient stars due to the fact that the organizer stumbled across my data on V348 Sgr (one of the few hot R CrB's) and invited me to present a poster as he was impresssed about the data.
Josch
Josch
I have nearly 2 month of data and see quite some variation in magnitude in I and V. The B magnitude is too low so I will switch so R instead.
Data are with the AAVSO database.
Josch
Thanks, Josch, for following this star. Are such variations common in hot R CrB's? I have not noticed this ni other RCBs I observe. eg S APS, W MEN.
Stephen [HSP]
New Zealand
Hi Stephen,
is this a hot R CrB star? I follow one (V348Sgr) and there is large variation. To my knowlegde there are only 5 hot R CrB's known. This knowlegde I learned from the HDEF2018 conference in Armagh, where I had a poster about this star.
Josch
Josh, please ignore the reference to it being a hot RBC. I misread a reference.
Here is a link to an interetsing article by John Percy and Kevin Dembski: "A Study of Pulsation and Fadings in some R Coronae Borealis (RCB) Stars"(2018)
https://www.aavso.org/apps/jaavso/article/3413/
Stephen [HSP]
New Zealand
Thanks for the link.
I found this one talking about NSV 13098 specifically based on ASAS data.
https://arxiv.org/pdf/1204.4181.pdf
Josch