DOI QR코드

DOI QR Code

NEW VARIABLE STARS IN THE REGION OF THE OPEN CLUSTER M38 (NGC 1912) I: δ SCUTI AND γ DORADUS TYPE STARS

산개성단 M38 (NGC 1912) 영역의 새로운 변광성 I: δ Scuti와 γ Doradus 변광성

  • Published : 2009.12.31

Abstract

From the short-period variability survey (SPVS) in Bohyunsan Optical Astronomy Observatory, we obtained time-series BV CCD images in the region of an open cluster M38 (NGC 1912) for 23 nights from February 1, 2007 to December 7, 2008. We found 18 $\delta$ Scuti stars and 2 $\gamma$ Doradus stars. Among them, only 3 $\delta$ Scuti stars were known ones. From the color-magnitude diagram (CMD) of M38, most of them have been located in the instability strip. The two $\gamma$ Doradus stars have been located within $\gamma$ Doradus strip of M38. But, only four $\delta$ Scuti stars were located within radius 10' from the center of M38. To confirm of their membership for M38, we need more study, such as, proper motion by spectroscopic observation.

Keywords

References

  1. Breger, M., 1979, Delta Scuti & Related Stars, PASP,91, 5 https://doi.org/10.1086/130433
  2. Jeon, Y.-B., 2008, Variable Stars in the region of an open cluster M50, PKAS, 23, 17 https://doi.org/10.5303/PKAS.2008.23.2.017
  3. Jeon, Y.-B., 2009, Variable Stars in the Region of an Young Open Cluster M29 (NGC 6913), PKAS, accepted
  4. Jeon, Y.-B., Nam, K.-H., Park, Y.-H., et al., 2007, Preliminary Results for Short-Period Variability Survey (SPVS): New Field Variable Stars, PKAS,22, 141 https://doi.org/10.5303/PKAS.2007.22.4.141
  5. Jeon, Y.-B., Kim, S.-L., Park, Y.-H., et al., 2005a, Short-Period Variability Survey (SPVS) in BOAO, PKAS, 20, 21 https://doi.org/10.5303/PKAS.2005.20.1.021
  6. Jeon, Y.-B., Park, Y.-H., Nam, K.-H., et al., 2005b, New Variable Stars around the Cepheid VariableTU Cas, PKAS, 20, 29 https://doi.org/10.5303/PKAS.2005.20.1.029
  7. Kim, S.-L. & Lee, S.-W., 1995, CCD Photometry of a Delta Scuti Star in an Open Cluster II. BT CNC in the Praesepe, JKAS, 28, 197
  8. Massey, P. & Davis, L. E., 1992, A User’s Guide to Stellar CCD photometry with IRAF
  9. Pandey, A. K., Sharma, S., Upadhyay, K., et al., 2007, Stellar Contents of Two Intermediate Age Clusters: NGC 1912 and NGC 1907, PASJ, 59, 547 https://doi.org/10.1093/pasj/59.3.547
  10. Samus, N. N., Durlevich, O. V., et al., 2004, Combined General Catalogue of Variable Stars(Samus+2004), VizieR Online Data Catalog,2250
  11. Stetson, P. B., 1987, DAOPHOT - A computer program for crowded-field stellar photometry, PASP,99, 191 https://doi.org/10.1086/131977
  12. Sung, H. & Bessell, M. S., 1999, UBVI CCD photometry of M35 (NGC 2168), MNRAS, 306, 361-370 https://doi.org/10.1046/j.1365-8711.1999.02522.x
  13. Szab´o, Gy. M., Fur´esz, G., Sz´ekely, P., & Szentgyorgyi, A., 2006, Kinematics and Variable Stars in NGC 1907 and NGC 1912, Sterken, C. and Aerts, C. (eds)., ASP Conference Series, 349, 339
  14. Subramaniam, A. & Sagar, R., 1999, Multicolor CCD Photometry and Stellar Evolutionary Analysis of NGC 1907, NGC 1912, NGC 2383, NGC 2384, and NGC 6709 Using Synthetic Color-Magnitude Diagrams, AJ, 117, 937 https://doi.org/10.1086/300716

Cited by

  1. NEW VARIABLE STARS IN THE REGION OF THE OPEN CLUSTER M48 (NGC 2548) vol.26, pp.4, 2011, https://doi.org/10.5303/PKAS.2011.26.4.141
  2. NEW VARIABLE STARS IN THE REGION OF THE OPEN CLUSTER M35 (NGC 2168) vol.25, pp.4, 2010, https://doi.org/10.5303/PKAS.2010.25.4.167