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COROT TARGETS PROGRESS REPORT ON THE
PHOTOMETRIC AND SPECTROSCOPIC MONITORING
OF DSCT, GDOR AND BCEP VARIABLE STARS


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In summer 2004 it has been possible to start the
target characterization. Several observing runs
in photometry Sierra Nevada Summer 2004
P. Amado and S. Martin S. Pedro Martir
Summer 2004 E. Poretti Sierra Nevada
Winter 2004-05 P. Amado and S. Martin S.
Pedro Martir Winter 2004-05 M. Alvarez
and E. Poretti APT
Winter 2004-05 W.W. Weiss Mercator
Summer 2005 C. Aerts and
coll. Piszkesteto Summer 2005
M. Paparò and coll. Sierra Nevada Summer
2005 S. Martin S. Pedro Martir Summer
2005 M. Alvarez S. Pedro Martir
Winter 2005-06 E. Poretti and. M. Alvarez S.
Pedro Martir Winter 2005-06 E. Michel
and STEPHI coll. Sierra Nevada Winter
2005-06 S. Martin and E. Rodriguez
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Positions of the DSCTGDOR targets in the CMD

• HD 44195 GDORDSCT
• HD 181147 DSCT
• HD 50870 DSCT
• HD 170782 DSCT
• HD 170699 DSCT
• HD 44283 DSCT
• HD 172189 EASB2DSCT
• HD 181555 DSCT (revised)
• HD 49434 GDOR
• HD 171834 GDOR
• HD 180642 BCEP
• HD 170580 BCEP

(Poretti et al. 2005, AJ 129, 2461)
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HD 44195, the hybrid GDOR DSCT star v sin i
58 km/s, in the field of HD 43587, f120.48 c/d
The DSCT variability seems to be
monoperiodic, The GDOR variability seems to be
multiperiodic
NOVEMBER 2003 (8 nights)
JANUARY 2005 (4 nights)
NOVEMBER 2005 (6 nights)
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HD 44283, multiperiodic DSCT variable, small v
sin i (19 km/s), evolved (?)
15.00 c/d, predominant mode (ampl. 0.014 mag in v)
Second term, f9.62 c/d, ampl. 0.005 mag in v)
Asteroseismic peaks in the 10-25 c/d range, ampl.
lt 0.003 mag in v)
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The field of HD 43587 asterosesismic
orientation of the pointing
1.0 solar mass star, MS
Target currently in the short list
STARE CCD photometry S. Pedro Martir uvby
photometry Sierra Nevada uvby
photometry Mercator, APT, SAAO contributions
1 HD 43021 V7.82 ZAMS
11 c/d , 80 km/s 2 HD 44283 V9.29 zigzags
15 c/d 19 km/s 3 HD 44195
V7.57 ZAMS hybrid GDORDSCT 58 km/s
5 Red variable 6 Hipparcos variable 7
GSC00144-03031 DM HADS V10.2 Be HD 43285,
V6.07
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HD 49434, confirmation of the light variability
High precision photometry (s.d. better than
0.002 mag) on four consecutive nights. Peak-to-pe
ak amplitudes 0.022 mag in violet 0.019 mag in
blue 0.016 mag in yellow Multiperiodicity
probable. The observations planned in December
(OSN and SPM) will be decisive to
detect periodicities. Additional APT timeseries
available.
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HD 50870, a DSCT star in the field of HD 52265
f117.15 c/d f214.00 c/d . Slow rotator, Veq
sin i 17 km/s Predominant mode STEPHI
campaign in November 2005
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The positioning of HD 58070 could be a critical
item
HD 52265 and HD 58070 are located on the
edges. There are three Be stars close to HD 58070
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HD 172189, orbital period has been detected
5.702 d. Eccentric orbit with only one
minimum. DSCT pulsation frequencies in the 18-20
c/d interval. (Martin et al., 2005, AA 440, 711)
The RV curve has been the goal of
successful spectroscopic observations in past
summer (OHP, SLN, ESO). Target of a STEPHI
campaign in 2004.
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HD 180642, Beta Cep variable, but probably not
a multiperiodic one
Monitored at SPM and OSN in Stromgren
photometry, with Mercator telescope in the Geneva
system and and with M. Piszkesteto telescope in
V filter Pulsational frequency term
identified as the Fundamental radial mode
(Aerts et al., in preparation)
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Reminiscent of the case of BW Vul (Sterken and
coll.)
BW Vul
HD 180642, Mercator and Mt. Piszkesteto light
curves in V light
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Target Type Field
Frequencies V Sp
V sin i
HD 44195 hybrid HD 43587 f20.5 c/d
flt 5c/d 7.56 F0 58 km/s HD 50870
DSCT HD 52265 f17.5 13-15
8.88 F0 17 km/s HD 44283 DSCT HD 43587
f15.0 10-25 9.29 F5
19 km/s HD 181147 DSCT HD 181555 f15.4
14-17.5 c/d 8.74 A5 98 km/s HD
170782 DSCT HD 170580 13-25 c/d
7.81 A2 197 km/s HD 170699 DSCT
HD 170580 10-15 c/d
6.95 A3 gt200 km/s HD 172189 DSCT HD 171834
17-19 c/d EA SB2 8.85 A2 48 and 75 HD
181555 DSCT primary target 8-18 c/d
7.98 A5 170 km/s HD 49434
GDOR photometric variability CONFIRMED 5.75
F1 90 km/s HD 171834 GDOR no photometric
variability 5.43 F5 72
km/s HD 180642 BCEP HD 181555 f5.49
c/d, standstill 8.29 B1 37 km/s HD 170580
BCEP no photometric variability, multiple
system 6.68 B2V