[vsnet-chat 5566] Re: [AAVSO-DIS] V 4742 Sgr

[Arne Henden <aah@nofs.navy.mil>]

These stars should all be in my BVRI field photometry
file at
http://ftp.nofs.navy.mil/pub/outgoing/aah/sequence/v4742sgr.dat
Arne
-------------

DWest61506@aol.com wrote:
> Brian, Stan:
> To clarify my earlier post on the magnitude of GSC 6846:6, I measure the 
> position of the star at 18 03 14.47 -25 14 22.1 +/-0.5".  The plate 
> solution used 15 GSC 1.1 stars.
> 
> Regards,
> Doug
> 
> In a message dated 10/12/2002 5:15:48 AM Central Standard Time, 
> Brian.Skiff@lowell.edu writes:
> 
> 
>         The red stars appears to be the western star of two that are about
>     35" apart east-west.  The position Stan quoted is for the eastern star,
>     but the GSC number was for the western star.  The eastern star is a
>     little
>     brighter in V, so it is probably best assigned the designation CD-25
>     12628.
>     The western red star is at:  18 03 14.40 -25 14 21.9 (J2000, UCAC1).
>     Tycho-2 shows V=11.2 and B-V=1.5 (large uncertainties, so no more
>     decimals).
>          The star is a bona fide infrared-bright source:  IRC -30347 =
>     IRAS 18001-2514 = MSX5C G005.1743-01.5120, and somewhat surprisingly is
>     also a ROSAT x-ray source 1RXS J180326.2-251556.  Hansen & Blanco
>     (1975AJ.....80.1011H) give the spectral calssification as type M6.
>          So it is unsurprising that the star is variable.
> 
>          You can look up all this catalogue stuff yourself using the
>     Strasbourg
>     VizieR query utility starting at:
> 
>     http://vizier.u-strasbg.fr/cgi-bin/VizieR
> 
>     Just key-in the position and hit the 'find data' button, and it'll
>     search
>     "everything".  Actually before hitting the search button, change the
>     search radius to something reasonable like 30 or 60 arcsec, _not_ the
>     10 arcmin default value (that yields huge lists in crowded regions).
>     The catalogues searched, by the way, include the GCVS version 4.1 and
>     the NSV and NSVS.
> 
>     \Brian
> 
> 
>

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