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

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. MartinS. 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. PorettiAPT 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. MartinS. Pedro Martir Summer 2005 M. Alvarez

S. Pedro Martir Winter 2005-06 E. Poretti and. M. AlvarezS. Pedro Martir Winter 2005-06 E. Michel and STEPHI coll. Sierra Nevada Winter 2005-06 S. Martin and E. Rodriguez

Positions of the DSCT+GDOR targets in the CMD

1 HD 44195 GDOR+DSCT

2 HD 181147 DSCT

3 HD 50870 DSCT

4 HD 170782 DSCT

5 HD 170699 DSCT

6 HD 44283 DSCT

7 HD 172189 EA+SB2+DSCT

8 HD 181555 DSCT (revised)

9 HD 49434 GDOR

10 HD 171834 GDOR

11 HD 180642 BCEP12 HD 170580 BCEP

(Poretti et al. 2005, AJ 129, 2461)

NOVEMBER 2003 (8 nights) JANUARY 2005 (4 nights)

HD 44195, the hybrid GDOR + DSCT star v sin i = 58 km/s, in the field of HD 43587, f1=20.48 c/d

NOVEMBER 2005 (6 nights)

The DSCT variability seems to be monoperiodic,The GDOR variability seems to be multiperiodic

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, f=9.62 c/d,

ampl. 0.005 mag in v)

Asteroseismic peaksin the 10-25 c/d range,ampl. < 0.003 mag in v)

The field of HD 43587: asterosesismic orientation of the pointing

1.0 solar mass star, MS

Target currently in the short list

STARE CCD photometryS. Pedro Martir uvby photometrySierra Nevada uvby photometryMercator, APT, SAAO contributions

1 HD 43021 V=7.82 ZAMS 11 c/d , 80 km/s

2 HD 44283 V=9.29 zigzags 15 c/d 19 km/s

3 HD 44195 V=7.57 ZAMS hybrid GDOR+DSCT 58 km/s

5 Red variable 6 Hipparcos variable 7 GSC00144-03031 DM HADS V=10.2 Be : HD 43285, V=6.07

HD 49434, confirmation of the light variability

High precision photometry(s.d. better than 0.002 mag)on four consecutive nights.

Peak-to-peak amplitudes0.022 mag in violet0.019 mag in blue0.016 mag in yellow

Multiperiodicity probable.The observations plannedin December (OSN and SPM)will be decisive to detectperiodicities.

Additional APT timeseries available.

HD 50870, a DSCT star in the field of HD 52265

f1=17.15 c/df2=14.00 c/d……….

Slow rotator,Veq sin i = 17 km/sPredominant mode

STEPHI campaignin November 2005

The positioning of HD 58070 could be a critical item

HD 52265 and HD 58070 are located on the edges.

There are three Be starsclose to HD 58070

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, A&A 440, 711)

The RV curvehas been the goal of successfulspectroscopicobservations inpast summer(OHP, SLN, ESO).

Target of a STEPHI campaignin 2004.

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)

Reminiscent of the case of BW Vul (Sterken and coll.)

HD 180642, Mercator andMt. Piszkesteto light curvesin V light

BW Vul

HD 44195 hybrid HD 43587 f=20.5 c/d f< 5c/d 7.56 F0 58 km/sHD 50870 DSCT HD 52265 f=17.5 13-15 8.88 F0 17 km/sHD 44283 DSCT HD 43587 f=15.0 10-25 9.29 F5 19 km/s

HD 181147 DSCT HD 181555 f=15.4 14-17.5 c/d 8.74 A5 98 km/sHD 170782 DSCT HD 170580 13-25 c/d 7.81 A2 197 km/sHD 170699 DSCT HD 170580 10-15 c/d 6.95 A3 >200 km/sHD 172189 DSCT HD 171834 17-19 c/d EA +SB2 8.85 A2 48 and 75HD 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/sHD 171834 GDOR no photometric variability 5.43 F5 72 km/s

HD 180642 BCEP HD 181555 f=5.49 c/d, standstill 8.29 B1 37 km/sHD 170580 BCEP no photometric variability, multiple system 6.68 B2V

Target Type Field Frequencies V Sp V sin i