Soft X-ray and FUV observations of Nova Her 2021 (V1674 Her) with <i>AstroSat</i>-Reference-Cited by-同舟云学术

Soft X-ray and FUV observations of Nova Her 2021 (V1674 Her) with AstroSat

Published:2023-12-18 Issue:1 Volume:528 Page:28-38
ISSN:0035-8711
Container-title:Monthly Notices of the Royal Astronomical Society
language:en
Short-container-title:

Author:

Bhargava Yash¹²^ORCID,Dewangan Gulab Chand¹^ORCID,Anupama G C³^ORCID,Kamath U S³^ORCID,Sonith L S³,Singh Kulinder Pal⁴^ORCID,Drake J J⁵⁶,Beardmore A⁷^ORCID,Luna G J M⁸,Orio M⁹¹⁰^ORCID,Page K L⁷^ORCID

Affiliation:

1. Inter-University Centre for Astronomy and Astrophysics , Ganeshkhind, Pune 411007 , India

2. Department of Astronomy and Astrophysics, Tata Institute of Fundamental Research , 1 Homi Bhabha Road, Colaba, Mumbai 400005 , India

3. Indian Institute of Astrophysics , II Block Koramangala, Bengaluru 560034 , India

4. Department of Physical Sciences, Indian Institute of Science Education and Research Mohali , Knowledge City, Sector 81, SAS Nagar, Punjab 140306 , India

5. Center for Astrophysics|Harvard and Smithsonian , 60 Garden Street, Cambridge, MA 02138 , USA

6. Lockheed Martin , 3251 Hanover St, Palo Alto, CA 94304 , USA

7. School of Physics and Astronomy, The University of Leicester , University Road, Leicester LE1 7RH , UK

8. CONICET/Universidad Nacional de Hurlingham , Av. Gdor. Vergara 2222, Villa Tesei, 1686 Buenos Aires , Argentina

9. INAF-Osservatorio di Padova , Vicolo Osservatorio 5, I-35122 Padova , Italy

10. Department of Astronomy, University of Wisconsin , 475 N, Charter Street, Madison, WI 53706 , USA

Abstract

ABSTRACT Nova Her 2021 or V1674 Her was one of the fastest novae to be observed so far. We report here the results from our timing and spectral studies of the source observed at multiple epochs with AstroSat. We report the detection of a periodicity in the source in soft X-rays at a period of 501.4–501.5 s which was detected with high significance after the peak of the super-soft phase, but was not detected in the far ultraviolet (FUV) band of AstroSat. The shape of the phase-folded X-ray light curves has varied significantly as the nova evolved. The phase-resolved spectral studies reveal the likely presence of various absorption features in the soft X-ray band of 0.5–2 keV, and suggest that the optical depth of these absorption features may be marginally dependent on the pulse phase. Strong emission lines from Si, N, and O are detected in the FUV, and their strength declined continuously as the nova evolved and went through a bright X-ray state.

Funder

Smithsonian Astrophysical Observatory

Indian National Science Academy

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

Link

https://academic.oup.com/mnras/advance-article-pdf/doi/10.1093/mnras/stad3870/54587800/stad3870.pdf

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