Hostname: page-component-78c5997874-fbnjt Total loading time: 0 Render date: 2024-11-05T04:28:57.713Z Has data issue: false hasContentIssue false
  • English
  • Français

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

Published online by Cambridge University Press:  11 March 2020

Sindhu N Open the ORCID record for Sindhu N [Opens in a new window] ,
Annapurni Subramaniam ,
Aaron M. Geller ,
Vikrant Jadhav ,
Christian Knigge ,
Mirko Simunovic ,
Nathan Leigh ,
Michael Shara  and
Thomas H. Puzia
Sindhu N
Affiliation:
School of Advanced Sciences, VIT, Vellore -632014, India email: [email protected] Indian Institute of Astrophysics, Koramangala II Block, Bangalore-560034, India
Annapurni Subramaniam
Affiliation:
Indian Institute of Astrophysics, Koramangala II Block, Bangalore-560034, India
Aaron M. Geller
Affiliation:
CIERA and Department of Physics & Astronomy, Northwestern University, Evanston, IL60201, USA Adler Planetarium, Dept. of Astronomy, Chicago, IL60605, USA
Vikrant Jadhav
Affiliation:
Indian Institute of Astrophysics, Koramangala II Block, Bangalore-560034, India JAP and Physics Department, Indian Institute of Science, Bangalore - 560012, India
Christian Knigge
Affiliation:
School of Physics and Astronomy, University of Southampton, Southampton, UK
Mirko Simunovic
Affiliation:
Gemini Observatory, 670 N Aohoku Pl, Hilo, Hawaii96720 Subaru Telescope, 650 N Aohoku Pl, Hilo, Hawaii96720, USA
Nathan Leigh
Affiliation:
Departamento de Astronomía, Facultad de Ciencias Físicas y Matemáticas, Universidad de Concepción, Concepción, Chile Department of Astrophysics, American Museum of Natural History, NY10024, USA
Michael Shara
Affiliation:
Department of Astrophysics, American Museum of Natural History, NY10024, USA
Thomas H. Puzia
Affiliation:
Institute of Astrophysics, Pontificia Universidad Católica de Chile, Santiago, Chile
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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.

Keywords

open clusters and associations: individual (M67)stars: blue stragglersstars: white dwarfsultraviolet: stars
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S351: Star Clusters: From the Milky Way to the Early Universe , May 2019 , pp. 482 - 485
Copyright
© International Astronomical Union 2020

References

Castelli, F., Gratton, R. G., & Kurucz, R. L. 1997, A&A, 318, 841Google Scholar
Geller, A. M., Latham, D. W., & Mathieu, R. D. 2015, AJ, 150, 97CrossRefGoogle Scholar
Gosnell, N. M., Mathieu, R. D., Geller, A. M., Sills, A., Leigh, N., & Knigge, C. 2015, ApJ, 814, 163CrossRefGoogle Scholar
Hills, J. G. & Day, C. A. 1976, Ap. Lett., 17, 87Google Scholar
Koester, D. 2010, MemSAIt, 81, 921Google Scholar
Knigge, C., Dieball, A., Maz Apellániz, J., Long, K. S., Zurek, D. R., & Shara, M. M., 2008, ApJ, 683, 1006CrossRefGoogle Scholar
Knigge, C., Leigh, N., & Sills, A. 2009, Nature, 457, 288CrossRefGoogle Scholar
Leigh, N. & Sills, A. 2011, MNRAS, 410, 2370CrossRefGoogle Scholar
Mathieu, R. D. & Geller, A. M. 2009, Nature, 462, 1032CrossRefGoogle Scholar
McCrea, W. H. 1964, MNRAS, 128, 147CrossRefGoogle Scholar
Milone, A. A. E. & Latham, D. W. 1992, IAU, 151, 475Google Scholar
Naoz, S. & Fabrycky, D. C. 2014, ApJ, 793, 137CrossRefGoogle Scholar
Panei, J. A., Althaus, L. G., Chen, X., & Han, Z. 2007, MNRAS, 382, 779CrossRefGoogle Scholar
Perets, H. B. & Fabrycky, D. C. 2009, ApJ, 697, 1048CrossRefGoogle Scholar
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, 34CrossRefGoogle Scholar
Shetrone, M. D. & Sandquist, E. L. 2000, AJ, 120, 1913CrossRefGoogle Scholar
Sindhu, N., Subramaniam, A., & Radha, C. A. 2018, MNRAS, 481, 226Google Scholar
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:1907.05556Google Scholar
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, L27Google Scholar
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, 128CrossRefGoogle Scholar