[vsnet-newvar 841] HD172468 = NSV24534 mystery

[Taichi Kato <tkato>]

HD172468 = NSV24534 mystery

   According to Astron. Astrophys. 364, 706 (2000), Messima et al.
reports that the 7-th mag star HD172468 showed temporary 1-4 mag fadings,
and sometimes undetectable by their APT observations.  Let's have a watch
for the next fading!  Spectroscopy and multicolor photometry during the
fade will be crucial in understanding the nature of this object.
The object is not (very) hydrogen-deficient, and looks different from
a classical R CrB-type star.

   Interetingly enough, the GSC magnitude 11.16 is more than three magnitudes
fainter than usual!  However, Hipparcos didn't pick up this star as
a variable star.

GSC3539.1298 183741.10 +515645.2 (2000.0) 11.16 1
USNO1350.09989574 183741.160 +515644.77 (2000.0) 99.9  8.7
USNO1350.09989585 183741.190 +515641.39 (2000.0) 11.2  8.9 *
USNO1350.09989772 183742.272 +515702.59 (2000.0) 13.4 17.1
USNO1350.09990088 183743.914 +515612.44 (2000.0) 13.4 19.5
2MASS 183741.052 +515645.25 (2000.0)  0.000  0.000  4.378
IRAS18365+5154 183631.0 +515402 (1950.0)
    F12=0.76  F25=0.17  F60=0.40L F100=1.00L
    VAR= 0 LRS=-1
 possibly I: oxygen-rich non-variable star without circumstellar shell
 or VIa: non-variable star with relatively cold dust at large
      distance, may be carbon-rich
183740.8 +515646 (2000.0) BD+51.2410 7.7
183737.1 +515617 (2000.0) HD172468 7.8 8.9 K2
183740.5 +515643 (2000.0) IRAS18365+5154 0.752 0.172 0.400L 1.000L 0%
183740.5 +515643 (2000.0) SSC18365+5154 0.752 0.172 0.400L 1.000L
183740.6 +515643 (2000.0) FSC18365+5154 0.710 0.177 0.096L 0.540L
183740.9 +515644 (2000.0) SAO31077 8.7 7.5 K2
183741.0 +515645 (2000.0) 752H 1.25 HIP091329 plx=3.11(0.61) (0.01 0.01)
183741.0 +515645 (2000.0) 753 1.25 TYC3539.1298.1 plx=-2.8(5.3) (0.01 0.01)
183741.0 +515644 (2000.0) 753 1.27 TYC2-3539.1298.1 (7.66 0.01) (9.16 0.02)
183741.0 +515645 (2000.0) NSV24534 VAR: 7.51 - V - - - -

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