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Faculty Publications -Articles
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The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
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Decoding the X-Ray Flare from MAXI J0709-159 Using Optical Spectroscopy and Multiepoch Photometry
Description
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We present a follow-up study on the recent detection of two X-ray flaring events by MAXI/Gas Slit Camera observations in soft and hard X-rays from MAXI J0709-159 in the direction of HD 54786 (LY CMa), on 2022 January 25. The X-ray luminosity during the flare was around 1037 erg s-1 (MAXI), which got reduced to 1032 erg s-1 (NuSTAR) after the flare. We took low-resolution spectra of HD 54786 from the 2.01 m Himalayan Chandra Telescope and the 2.34 m Vainu Bappu Telescope (VBT) facilities in India, on 2022 February 1 and 2. In addition to H? emission, we found emission lines of He i in the optical spectrum of this star. By comparing our spectrum of the object with those from the literature we found that He i lines show variability. Using photometric studies we estimate that the star has an effective temperature of 20,000 K. Although HD 54786 is reported as a supergiant in previous studies, our analysis favors it to be evolving off the main sequence in the color-magnitude diagram. We could not detect any infrared excess, ruling out the possibility of IR emission from a dusty circumstellar disk. Our present study suggests that HD 54786 is a Be/X-ray binary system with a compact object companion, possibly a neutron star. 2022. The Author(s). Published by the American Astronomical Society.
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Bhattacharyya S.; Mathew B.; Ezhikode S.H.; Muneer S.; G. S.; G. M.; Arun R.; Anilkumar H.; Banerjee G.; Kumar S P.; Kartha S.S.; Paul K.T.; Velu C.
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Astrophysical Journal Letters, Vol-933, No. 2
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American Astronomical Society
Date
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2022-01-01
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<a href="https://doi.org/10.3847/2041-8213/ac7b8a" target="_blank" rel="noreferrer noopener">https://doi.org/10.3847/2041-8213/ac7b8a</a>
<br /><br /><a href="https://www.scopus.com/inward/record.uri?eid=2-s2.0-85134715004&doi=10.3847%2F2041-8213%2Fac7b8a&partnerID=40&md5=2c9aa0eb23b7d85f160fd0140b4276ca" target="_blank" rel="noreferrer noopener">https://www.scopus.com/inward/record.uri?eid=2-s2.0-85134715004&doi=10.3847%2f2041-8213%2fac7b8a&partnerID=40&md5=2c9aa0eb23b7d85f160fd0140b4276ca</a>
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All Open Access; Gold Open Access; Green Open Access
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ISSN: 20418205
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Online
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English
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Article
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Bhattacharyya S., Department of Physics and Electronics, CHRIST (Deemed to Be University), Hosur Main Road, Bangalore, India; Mathew B., Department of Physics and Electronics, CHRIST (Deemed to Be University), Hosur Main Road, Bangalore, India; Ezhikode S.H., Department of Physics and Electronics, CHRIST (Deemed to Be University), Hosur Main Road, Bangalore, India; Muneer S., Indian Institute of Astrophysics, Koramangala, Bangalore, India; G. S., Indian Institute of Astrophysics, Koramangala, Bangalore, India; G. M., Indian Institute of Astrophysics, Koramangala, Bangalore, India; Arun R., Department of Physics and Electronics, CHRIST (Deemed to Be University), Hosur Main Road, Bangalore, India, Indian Institute of Astrophysics, Koramangala, Bangalore, India; Anilkumar H., Department of Physics and Electronics, CHRIST (Deemed to Be University), Hosur Main Road, Bangalore, India; Banerjee G., Department of Physics and Electronics, CHRIST (Deemed to Be University), Hosur Main Road, Bangalore, India; Kumar S P., Indian Institute of Astrophysics, Koramangala, Bangalore, India; Kartha S.S., Department of Physics and Electronics, CHRIST (Deemed to Be University), Hosur Main Road, Bangalore, India; Paul K.T., Department of Physics and Electronics, CHRIST (Deemed to Be University), Hosur Main Road, Bangalore, India; Velu C., Indian Institute of Astrophysics, Koramangala, Bangalore, India