Skip to main content Accessibility help
×
Home

Detection of White Dwarf companions to Blue Straggler Stars from UVIT observations of M67

  • Sindhu N (a1) (a2), Annapurni Subramaniam (a2), Aaron M. Geller (a3) (a4), Vikrant Jadhav (a2) (a5), Christian Knigge (a6), Mirko Simunovic (a7) (a8), Nathan Leigh (a9) (a10), Michael Shara (a10) and Thomas H. Puzia (a11)...

Abstract

We investigate the old open cluster M67 using ultraviolet photometric data of Ultra-Violet Imaging Telescope in multi-filter far-UV bands. M67, well known for the presence of several blue straggler stars (BSS), has been put to detailed tests to understand their formation pathways. Currently, there are three accepted formation channels: mass transfer due to Roche-lobe overflow in binary systems, stellar mergers either due to dynamical collisions or through coalescence of close binaries. So far, there had not been any confirmed detection of a white dwarf (WD) companion to any of the BSSs in this cluster. Here, we present the detection of WD companions to 5 bright BSSs in M67. The multiwavelength spectral energy distributions covering 0.12 -11.5 μm range, were found to require binary spectral fits for 5 BSSs, consisting of a cool (BSS) and a hot companion. The parameters (Luminosity, Temperature, Radius and Mass) of the hot companions suggest them to be WDs with mass in the range 0.2 - 0.35 M with Teff ~11000 –24000 K.

Copyright

References

Hide All
Castelli, F., Gratton, R. G., & Kurucz, R. L. 1997, A&A, 318, 841
Geller, A. M., Latham, D. W., & Mathieu, R. D. 2015, AJ, 150, 97
Gosnell, N. M., Mathieu, R. D., Geller, A. M., Sills, A., Leigh, N., & Knigge, C. 2015, ApJ, 814, 163
Hills, J. G. & Day, C. A. 1976, Ap. Lett., 17, 87
Koester, D. 2010, MemSAIt, 81, 921
Knigge, C., Dieball, A., Maz Apellániz, J., Long, K. S., Zurek, D. R., & Shara, M. M., 2008, ApJ, 683, 1006
Knigge, C., Leigh, N., & Sills, A. 2009, Nature, 457, 288
Leigh, N. & Sills, A. 2011, MNRAS, 410, 2370
Mathieu, R. D. & Geller, A. M. 2009, Nature, 462, 1032
McCrea, W. H. 1964, MNRAS, 128, 147
Milone, A. A. E. & Latham, D. W. 1992, IAU, 151, 475
Naoz, S. & Fabrycky, D. C. 2014, ApJ, 793, 137
Panei, J. A., Althaus, L. G., Chen, X., & Han, Z. 2007, MNRAS, 382, 779
Perets, H. B. & Fabrycky, D. C. 2009, ApJ, 697, 1048
Sahu, S., Subramaniam, A., Simunovic, M., Postma, J., Côté, P., Kameswera Rao, N., Geller, A. M., Leigh, N., Shara, M., Puzia, T. H., & Stetson, P. B. 2019, ApJ, 876, 34
Shetrone, M. D. & Sandquist, E. L. 2000, AJ, 120, 1913
Sindhu, N., Subramaniam, A., & Radha, C. A. 2018, MNRAS, 481, 226
Sindhu, N, Subramaniam, A., Jadhav, V. V, Chatterjee, S., Geller, A.M., Knigge, C., Leigh, N., Puzia, T.H., Shara, M., & Simunovic, M. 2019, arXiv:1907.05556
Subramaniam, A., Sindhu, N., TandonS, N. S, N., Kameswara, Rao N., Postma, J., Patrick, Coté., Hutchings, J., GhoshS, K. S, K., George, K., Girish, V., Mohan, R., Murthy, J., Sankarasubramanian, K., StalinC, S. C, S., Sutaria, F., Mondal, C., & Sahu, S. 2016, Ap. Lett., 833, L27
Tandon, S. N., Subramaniam, A., Girish, V., Postma, J., Sankarasubramanian, K., Sriram, S., Stalin, C. S., Mondal, C., Sahu, S., Joseph, P., Hutchings, J., Ghosh, S. K., Barve, I. V., George, K., Kamath, P. U., Kathiravan, S., Kumar, A., Lancelot, J. P., Leahy, D., Mahesh, P. K., Mohan, R., Nagabhushana, S., Pati, A. K., Kameswara Rao, N., Sreedhar, Y. H., Sreekumar, P. 2017, AJ, 154, 128
MathJax
MathJax is a JavaScript display engine for mathematics. For more information see http://www.mathjax.org.

Keywords

Detection of White Dwarf companions to Blue Straggler Stars from UVIT observations of M67

  • Sindhu N (a1) (a2), Annapurni Subramaniam (a2), Aaron M. Geller (a3) (a4), Vikrant Jadhav (a2) (a5), Christian Knigge (a6), Mirko Simunovic (a7) (a8), Nathan Leigh (a9) (a10), Michael Shara (a10) and Thomas H. Puzia (a11)...

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed.