[vsnet-chat 7816] Re: probably mis-classified UG stars

Mon Jul 9 09:45:22 JST 2012

Dear Sebastian Otero,

Thank you very much for your kind reply and excellent works on the VSX
database!

I should have checked the VSX database, and after this, I will :-)

Best regards,

> Dear Seiichi,
> 
> > While monitoring the outburst of UG-type stars, I found there are some
> > probably mis-classified stars.
> >
> > They are classified into UG-type in the GCVS. But some of them can be
> > Mira type, or some of them seems almost constant at bright state.
> >
> > * V1050 Aql : R.A. 19h51m43s.4, Decl. +10o51'15", 14.5-17.5 mag(p)
> >
> >    It is bright and red in the USNO-A2.0, 14.6 mag(R) and 17.5
> >    mag(B).
> >
> >    It is also recorded in the infrared catalog as IRAS 19493+1043.
> >
> >    It is also recorded as a long periodic variable NSVS
> >    1951432+105114, with a period of 270 days.
> 
> 
> VSX has the right type since 2009:
> http://www.aavso.org/vsx/index.php?view=detail.top&oid=2189
> 
> It has been known as a mira since 1984:
> http://adsabs.harvard.edu/abs/1984IBVS.2577....1G
> 
> 
> 
> > * HN Cyg : R.A. 19h33m39s.9, Decl. +28o56'14", 13.3-16.0 mag(p)
> >
> >    It is bright and red in the USNO-A2.0, 12.5 mag(R) and 15.9
> >    mag(B).
> >
> >    It is also recorded in the infrared catalogs as IRAS 19316+2849
> >    and MSX5C G063.2797+04.4706.
> 
> 
> This one was known to be a red star since 1992:
> http://adsabs.harvard.edu/abs/1992A&AS...93..419B
> 
> I have updated it in VSX since it was in VSX as a possible mira but it is a 
> semiregular.
> http://www.aavso.org/vsx/index.php?view=detail.top&oid=11134
> 
> 
> > * V1285 Cyg : R.A. 19h44m49s.5, Decl. +35o59'35", 13.1-14.8 mag(p)
> >
> >    It is bright and red in the USNO-A2.0, 12.3 mag(R) and 14.2
> >    mag(B).
> >
> >    It is also recorded in the infrared catalog as IRAS 19429+3552.
> >    It looks bright in the 2MASS infrared images.
> 
> Also a SRB in VSX:
> http://www.aavso.org/vsx/index.php?view=detail.top&oid=12205
> 
> Known since 1987:
> http://adsabs.harvard.edu/abs/1987A&A...185..203B
> 
> 
> > * UY Vul : R.A. 20h55m52s.8, Decl. +26o40'52", 13.0-<16 mag(p)
> >
> >    It is bright and red in the USNO-A2.0, 12.8 mag(R) and 16.6
> >    mag(B).
> >
> >    It is also recorded in the infrared catalog as IRAS 20537+2629.
> >
> >    It is also recorded as a long periodic variable NSVS
> >    2055525+264049, with a period of 626 days.
> 
> The same as HN Cyg, it was found to be a red star in 1992:
> http://adsabs.harvard.edu/abs/1992A&AS...93..419B
> 
> It is in fact a mira with a period of 409 d:
> http://www.aavso.org/vsx/index.php?view=detail.top&oid=38213
> 
> 
> > * UZ Vul : R.A. 20h56m46s.0, Decl. +23o34'36", 14-<16 mag(p)
> >
> >    It is bright and red in the USNO-A2.0, 15.7 mag(R) and 18.3
> >    mag(B).
> >
> >    It looks bright in the 2MASS infrared images.
> 
> Also in
> http://adsabs.harvard.edu/abs/1992A&AS...93..419B
> A 248 d. mira:
> http://www.aavso.org/vsx/index.php?view=detail.top&oid=38214
> 
> 
> > * KM Lac : R.A. 22h13m49s.4, Decl. +55o28'26", 14.8-<17.4 mag(p)
> >
> >    It is bright in the USNO-A2.0, 14.4 mag(R) and 15.1 mag(B).
> >
> >    It keeps almost constant around 14.5-15 mag from 2007 to 2012 in
> >    the course of the MISAO Project survey.
> 
> 
> The problem with this one is that it is in a close pair. The 14.5 V-mag. 
> star is not the variable but the brighter companion 5" away. It is only in 
> 2MASS and NOMAD, not in USNO, GSC or UCAC.
> This one was classified as UGSS in VSX.
> Check out VSX for the right identification:
> http://www.aavso.org/vsx/index.php?view=detail.top&oid=16835
> 
> 
> > * LM Cas : R.A. 23h12m59s.9, Decl. +56o51'21", 15.8-<19 mag(p)
> >
> >    It is bright in the USNO-A2.0, 15.3 mag(R) and 16.0 mag(B).
> >
> >    It keeps almost constant around 16 mag from 2007 to 2012 in
> >    the course of the MISAO Project survey.
> 
> 
> The same situation, a brighter companion (V= 15.6) to the SW influencing the 
> photometry.
> The star is in GSC2.3 and SDSS.
> VSX info:
> http://www.aavso.org/vsx/index.php?view=detail.top&oid=6592
> 
> 
> > * V381 Lac : R.A. 22h15m58s.9, Decl. +42o22'47", 12.5-<16.2 mag(V)
> >  (Note that it is classified as NL, not UG, in the GCVS)
> >
> >    It is bright and red in the USNO-A2.0, 13.9 mag(R) and 17.1
> >    mag(B).
> >
> >    It is also recorded in the infrared catalog as IRAS 22138+4207.
> >
> >    I found the following paper on this star, which suggests it is a
> >    Mira variable.
> >
> > FBS 2213+421: A dust-enshrouded long-period AGB Mira variable?
> > K. S. Gigoyan and D. Russeil
> > Astrofizika, Vol. 49, No. 1, pp. 91--96 (February 2006).
> > www.springerlink.com/index/d3144m831h713w40.pdf
> 
> 
> That paper was also in VSX and type was M:.
> However, NSVS data suggests it is a semiregular star with a main period of 
> 170 d. J-K is 5.4, extremely red(dened).
> http://www.aavso.org/vsx/index.php?view=detail.top&oid=16970
> 
> So, search VSX when you have some doubt on classification, it is usually up 
> to date and if it is not, then you can revise the record with the data you 
> have found in the literature.
> 
> Cheers,
> Sebastian
> 
> -------------------------
> Sebastian Otero
> VSX Team
> American Association of Variable Star Observers

--
Seiichi Yoshida
comet at aerith.net
http://www.aerith.net/