Michael Koppelman asked on May 2, 2003:
OK, data divers, I need a new star. Hopefully something where 14h < RA < 18h or so. I'm going to start looking, too. There may be some stuff all the way back from DS23 that I could do.
Patrick Wils answered:
There are a number of eclipsing binaries which I found on Stardial
images, some of them are in the desired RA zone. I checked them in the
ASAS3 online data to confirm variability, but there are still aliasing
problems, which I hope someone can resolve. Perhaps Tom's reprocessed
data may already help here.
Here is the list (the amplitude and frequency are the ones I derived
from Stardial, they do not yet incorporate ASAS3 data):
ID Type Ampl Epoch Freq c/d Notes
HD 12064 EW? 0.2 2451410.91 1.308 = BD -0 2310
GSC04904-01087 EW? 0.5 2451218.79 1.061 Secondary minimum
amplitude 0.3 mag
(confirmed by
TASS Mk III V data,
I data is less clear)
HD 89027 EW 0.4 2452314.79 0.849
BD-3 3419 EW 0.5 2451661.69 1.299 = GSC04961-00667
= 1RXS J131032.4-040934
HD 116274 EW 0.6 2452376.74 1.654
NSV19680 EW 0.2 2451567.96 1.402 = HIP 64732 = HD 115247
BD-0 2900 EW 0.6 2451310.83 1.722 = GSC04987-00740
= TASS_J145340.0-010748,
Secondary minimum
amplitude 0.3 mag
HD 162905 EW 0.3 2452369.95 1.342
GSC05087-00198 EA?? 0.6 2451374.67 0.592 Fairly faint, uncertain
BD-4 2739 EA 0.5 2451581.77 2.392 = GSC04902-01190
= 1RXS J0950391.1-053029
Michael Koppelman wrote:
I took all the suggestions and checked NASA ADS for references. Two had
references not related to variability. One was published as a ROTSE
variable (as John mentioned). Here is the list with some additional ids
added.
id ra dec v_mag v_sig i_mag i_sig W-S ID
105239 213.9456 8.1364 10.550 0.190 9.760 0.203 17.19 GSC 00902-00318
119075 220.0445 6.2865 11.423 0.167 11.104 0.122 5.86 GSC 00332-00302
166278 245.0134 7.1246 9.875 0.087 8.953 0.082 9.97 BD+07 3142
166925 248.7951 5.8473 11.748 0.093 11.137 0.093 5.78 GSC 00394-01770
152307 252.2180 8.3187 11.665 0.147 11.006 0.134 7.85 ROTSE1 J164852.15+081907.6 (2000AJ....119.1901A)
159077 256.7212 6.5836 11.089 0.157 10.529 0.150 11.77 GSC 00410-02795
243.3281 6.0376 7.76 HD 145913 (1999A&AS..137..451G)
ID Type Ampl Epoch Freq Notes
HD 12064 EW? 0.2 2451410.91 1.308 = BD -0 2310
GSC04904-01087 EW? 0.5 2451218.79 1.061 Secondary minimum amplitude 0.3 mag
HD 89027 EW 0.4 2452314.79 0.849
BD-3 3419 EW 0.5 2451661.69 1.299 = GSC04961-00667 = 1RXS J131032.4-040934
HD 116274 EW 0.6 2452376.74 1.654
NSV19680 EW 0.2 2451567.96 1.402 = HIP 64732 = HD 115247
BD-0 2900 EW 0.6 2451310.83 1.722 = GSC04987-00740 = TASS_J145340.0-010748, Secondary minimum amplitude 0.3 mag
HD 162905 EW 0.3 2452369.95 1.342
GSC05087-00198 EA?? 0.6 2451374.67 0.592 Fairly faint, uncertain
BD-4 2739 EA 0.5 2451581.77 2.392 = GSC04902-01190 = 1RXS J0950391.1-053029 (2000AJ....120.1410T)
I need to do some more work but it looks like there are some fairly
bright stars with fairly large amplitudes. From Patrick's list (the
lower one) BD-0 2900, HD 116274 and BD-4 2739 look good because of the
high frequency and amplitude. It would be nice to find a flat-bottomed
eclipser just for the modeling fun. HD 145913 (from the top list) has
radial velocity from the paper and it's darn bright. BD+07 3142, also
from the top list, may be nearby according to Greaves, which may make
it interesting.
Any thoughts?