Journal of The Korean Astronomical Society (천문학회지)

The Korean Astronomical Society (한국천문학회)
권호 표지
DOI QR코드

DOI QR Code

UBV I CCD PHOTOMETRY OF THE OPEN CLUSTERS NGC 4609 AND HOGG 15

  • Kook, Seung-Hwa (Department of Astronomy and Space Science, Sejong University) ;
  • Sung, Hwan-Kyung (Department of Astronomy and Space Science, Sejong University) ;
  • Bessell, M.S. (Research School of Astronomy and Astrophysics, Australian National University)
  • Received : 2010.07.12
  • Accepted : 2010.08.25
  • Published : 2010.10.31
Download PDF
⟨ Previous Next ⟩

Abstract

UBV I CCD photometry is obtained for the open clusters NGC 4609 and Hogg 15 in Crux. For NGC 4609, CCD data are presented for the first time. From new photometry we derive the reddening, distance modulus and age of each cluster - NGC 4609 : E(B-V ) = $0.37{\pm}0.03$, $V_0-M_V=10.60{\pm}0.08$, log $\tau$= 7.7 $\pm$ 0.1; Hogg 15 : E(B - V ) = 1.13 $\pm$ 0.11, $V_0-M_V$ = 12.50 $\pm$ 0.15, log $\tau$ $\lesssim$ 6.6. The young age of Hogg 15 strongly implies that WR 47 is a member of the cluster. We also determine the mass function of these clusters and obtain a slope $\Gamma$ = -1.2 ($\pm$0.3) for NGC 4609 which is normal and a somewhat shallow slope (${\Gamma}=-0.95{\pm}0.5$) for Hogg 15.

Keywords

References

  1. Bertelli, G., Bressan, A., Chiosi, C., Fagotto, F., & Nasi, E. 1994, Theoretical Isochrones from Models with New Radiative Opacities, A&AS, 106, 275
  2. Bertelli, G., Nasi, E., Girardi, L., & Marigo, P. 2009, Scaled Solar Tracks and Isochrones in a Large Re- gion of the Z-Y Plane. II. from 2.5 to 20 M Stars, A&A, 508, 355 https://doi.org/10.1051/0004-6361/200912093
  3. Cheon, S., Sung, H., & Bessell, M. S. 2010, No Open Cluster in the Ruprecht 93 Region, JKAS, 43, 115
  4. Claria, J. J., Lapasset, E., & Minniti, D. 1989, Photometric Metal Abundances of High-Luminosity Red Stars in Young and Intermediate-Age Open Clusters, A&AS, 78, 363
  5. Feinstein, A., & Marraco, H. G. 1971, The Open Cluster NGC 4609 behind the Coalsack, PASP, 83, 218 https://doi.org/10.1086/129108
  6. Guetter, H. H., & Vrba, F. J. 1989, Reddening and Polarimetric Studies toward IC 1805, AJ, 98, 611 https://doi.org/10.1086/115161
  7. Hou, L. G., Han, J. L., & Shi, W. B. 2009, The Spiral Structure of Our Milky Way Galaxy, A&A, 499, 473 https://doi.org/10.1051/0004-6361/200809692
  8. Van der Hucht, K. A. 2001, The VII-th Catalogue of Galactic Wolf-Rayet Stars, New Astronomy Reviews, 45, 135 https://doi.org/10.1016/S1387-6473(00)00112-3
  9. Humphreys, R. M. 1978, Studies of Luminous Stars in Nearby Galaxies. I. Supergiants and O stars in the Milky Way, ApJS, 38, 309 https://doi.org/10.1086/190559
  10. Lamontagne, R. & Moffat, A. F. J. 1987, Precision Photometric Monitoring of Southern Variable Wolf-Rayet Stars with a Comment on the Overall Continuum Variability of WR stars, AJ, 94, 1008 https://doi.org/10.1086/114535
  11. Lamontagne, R., Moffat, A. F. J., Drissen, L., Robert, C., & Mathews, J. M. 1996, Photometric Determination of Orbital Inclinations and Mass Loss Rates for Wolf-Rayet Stars in WR+O Binaries, AJ, 112, 2227 https://doi.org/10.1086/118175
  12. Landolt, A. U. 1992, UBV RI Photometric Standard Stars in the Magnitude Range 11.5 < V < 16.0 around the Celestial Equator, AJ, 104, 340 https://doi.org/10.1086/116242
  13. Lim, B., Sung, H., Bessell, M. S., Karimov, R., & Ibrahimov, M. 2009, CCD Photometry of Standard Stars at Maidanak Astronomical Observatory in Uzbekistan: Transformations and Comparisons, JKAS, 42, 161
  14. Loden, L. O. 1979, Continued Studies of Loose Clusterings in the Southern Milky Way, A&AS, 38, 355
  15. Massey, P., DeGioia-Eastwood, K., & Waterhouse, E. 2001, The Progenitor Masses of Wolf-Rayet Stars and Luminous Blue Variables Determined from Cluster Turnoffs. II. Results from 12 Galactic Clusters and OB Associations, AJ, 121, 1050 https://doi.org/10.1086/318769
  16. Menzies, J. W., Marang, F., Laing, J. D., Coulson, I. M., & Engelbrecht, C. A. 1991, UBV $(RI)_C$ Photometry of Equatorial Standard Stars. A Direct Comparison between the Northern and Southern Systems, MNRAS, 248, 642 https://doi.org/10.1093/mnras/248.4.642
  17. Meynet, G., & Maeder, A. 2003, Stellar Evolution with Rotation X. Wolf-Rayet Star Populations at Solar Metallicity, A&A, 404, 975 https://doi.org/10.1051/0004-6361:20030512
  18. Moffat, A. F. J. 1974, The Wolf-Rayet Star HDE 311884 in the Open Cluster Hogg 15, A&A, 34, 29
  19. Moffat, A. F. J. et al. 1990, Photometric and Polarimetric Variability and Mass-Loss Rate of the Massive Binary Wolf-Rayet Star HDE 311884 (WN6 + O5:V), ApJ, 350, 767 https://doi.org/10.1086/168429
  20. Muzzio, J. C., Feinstein, A., & Orsatti, A. M. 1976, UBV and $H{\beta}$ Photometry of Faint Early Type Stars in Crux and Centaurus, PASP, 88, 526 https://doi.org/10.1086/129979
  21. Niemela, V. S., Conti, P. S., & Massey, P. 1980, HDE 311884: A Massive Wolf-Rayet Binary, ApJ, 241, 1050 https://doi.org/10.1086/158419
  22. Nugis, T., & Lamers, H. J. G. L. 2000, Mass-Loss Rates of Wolf-Rayet Stars as a Function of Stellar Parameters, A&A, 360, 227
  23. Orsatti, A. M., Vega, E., & Marraco, H. G. 1998, Polarimetry of the Highly Reddened Open Clusters Hogg 15 and Lynga14, AJ, 116, 266 https://doi.org/10.1086/300414
  24. Piatti, A. E., & Claria, J. J. 2001, On the Stellar Content of the Open Clusters Melotte 105, Hogg 15, Pismis 21 and Ruprecht 140, A&A, 370, 931 https://doi.org/10.1051/0004-6361:20010268
  25. Sagar, R., Munari, U., & de Boer, K. S. 2001, A Multicolour CCD Photometric and Mass Function Study of the Distant Southern Open Clusters NGC 3105, NGC 3603, Melotte 105, Hogg 15, NGC 4815, Pismis 20 and NGC 6253, MNRAS, 327, 23 https://doi.org/10.1046/j.1365-8711.2001.04438.x
  26. Smith, M. A., & Balona, L. 2006, The Remarkable Be Star HD 110432 (BZ Crucis), ApJ, 640, 491 https://doi.org/10.1086/499936
  27. Sung, H., & Bessell, M. S. 1999, UBV I CCD Photometry of M35 (NGC 2168), MNRAS, 306, 361 https://doi.org/10.1046/j.1365-8711.1999.02522.x
  28. Sung, H., & Bessell, M. S. 2004, The Initial Mass Function and Stellar Content of NGC 3603, AJ, 127, 1014 https://doi.org/10.1086/381297
  29. Sung, H., Bessell, M. S., Chun, M.-Y., Karimov, R., & Ibrahimov, M. 2008, The Initial Mass Function and Young Brown Dwarf Candidates in NGC 2264. III. Photometric Data, AJ, 135, 441 https://doi.org/10.1088/0004-6256/135/2/441
  30. Sung, H., Bessell, M. S., Lee, B.-W. & Lee, S.-G. 2002, The Open Cluster NGC 2516 - 1. Optical Photometry, AJ, 123, 290 https://doi.org/10.1086/324729
  31. Sung, H., Bessell, M. S., Lee, H.-W., Kang, Y. H., & Lee, S.-W. 1999, UBV I CCD Photometry of M11. II. New Photometry and Surface Density Profiles, MNRAS, 310, 982 https://doi.org/10.1046/j.1365-8711.1999.02961.x
  32. Sung, H., Bessell, M. S., & Lee, S.-W. 1998, UBV RI and $H{\alpha}$ Photometry of the Young Open Cluster NGC 6231, AJ, 115, 734 https://doi.org/10.1086/300207

Cited by

  1. THE STARBURST CLUSTER WESTERLUND 1: THE INITIAL MASS FUNCTION AND MASS SEGREGATION vol.145, pp.2, 2013, https://doi.org/10.1088/0004-6256/145/2/46
  2. An Optical and Infrared Photometric Study of the Young Open Cluster IC 1805 in the Giant H ii Region W4 † vol.230, pp.1, 2017, https://doi.org/10.3847/1538-4365/aa6d76
  3. THE SEJONG OPEN CLUSTER SURVEY (SOS). IV. THE YOUNG OPEN CLUSTERS NGC 1624 AND NGC 1931 vol.149, pp.4, 2015, https://doi.org/10.1088/0004-6256/149/4/127
  4. Sejong Open Cluster Survey (SOS) – II. IC 1848 cluster in the H ii region W5 West vol.438, pp.2, 2013, https://doi.org/10.1093/mnras/stt2283