Results 21 to 30 of about 495 (240)
Discovery of a probable very fast extragalactic nova in a symbiotic binary
Astronomy & Astrophysics, 2022 Very fast novae are novae that evolve exceptionally quickly (on timescales of only days). Due to their rapid evolution, very fast novae are challenging to detect and study, especially at early times. Here we report the discovery, made as part of our Transient UV Objects project, of a probable very fast nova in the nearby spiral galaxy NGC 300.
Modiano, D., Wijnands, R.
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V1494 Aql: Eclipsing Fast Nova with an Unusual Orbital Light Curve [PDF]
Publications of the Astronomical Society of Japan, 2004 Abstract We present the time-resolved photometry of V1494 Aql (Nova Aql 1999 No. 2) between 2001 November and 2003 June. The object is confirmed to be an eclipsing nova with a period of 0.1346138(2) d. The eclipses were present in all observed epochs.
Kato, T. +4 more
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Quark-Novae in the outskirts of galaxies: an explanation of the fast radio burst phenomenon [PDF]
Monthly Notices of the Royal Astronomical Society, 2020 ABSTRACT We show that old isolated neutron stars in groups and clusters of galaxies experiencing a Quark-Nova phase (QN: an explosive transition to a quark star) may be the source of fast radio bursts (FRBs). Each of the millions of fragments of the ultrarelativistic QN ejecta provides a collisionless plasma for which the ambient medium (
Rachid Ouyed, Denis Leahy, Nico Koning
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V2676 Oph: Estimating physical parameters of a moderately fast nova
Acta Astronomica, 2018 Using our previously reported observations, we derive some physical parameters of the moderately fast nova V2676 Ophiuchi 2012 # 1. The best-fit CLOUDY model of the nebular spectrum obtained on 2015 May 8 shows a hot white dwarf source with Tbb = 1.0 x 10^{5} K having a luminosity of 1.0 x 10^{38} ergs/s.
Raj, A. +4 more
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Light curves and absolute magnitudes of four recent fast LMC novae [PDF]
International Astronomical Union Colloquium, 2004 AbstractThe light curves of four recent fast LMC novae (Nova LMC 1988a, 1992, 1995, 2000) have been analysed to obtain the parameter t2 the time for a two magnitude decline below maximum light. Using the calibration of Della Valle & Livio (1995), values of MV at maximum are obtained.
J.B. Hearnshaw +3 more
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A NuSTAR observation of the fast symbiotic nova V745 Sco in outburst [PDF]
Monthly Notices of the Royal Astronomical Society: Letters, 2015 Abstract The fast recurrent nova V745 Sco was observed in the 3–79 keV X-rays band with NuSTAR 10 d after the optical discovery. The measured X-ray emission is consistent with a collisionally ionized optically thin plasma at temperature of about 2.7 keV.
Orio, M. +4 more
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DISCOVERY OF A NEW PHOTOMETRIC SUB-CLASS OF FAINT AND FAST CLASSICAL NOVAE [PDF]
The Astrophysical Journal, 2011 We present photometric and spectroscopic follow-up of a sample of extragalactic novae discovered by the Palomar 60-inch telescope during a search for "Fast Transients In Nearest Galaxies" (P60-FasTING). Designed as a fast cadence (1-day) and deep (g < 21 mag) survey, P60-FasTING was particularly sensitive to short-lived and faint optical transients.
Kasliwal, M. M. +8 more
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UBVJHKLM Photometry and Low-Resolution Spectroscopy of Nova Delphini 2013 (V339 Del)
Open Astronomy, 2015 We present UBVJHKLM photometric observations of Nova Delphini 2013 that started several hours before maximum light and lasted for 130 nights. Using the obtained data, we derived several photometric parameters of the Nova: the time of maximum light ...
Burlak M. A. +6 more
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The 1999 Optical Outburst of the Fast X-Ray Nova, V4641 Sagittarii [PDF]
Publications of the Astronomical Society of Japan, 2002 We report on the detection of an optical outburst which preceded the X-ray main flare of the fast X-ray nova V4641 Sagittarii. The object became active since early August 1999, and then experienced an optical outburst reaching 8.8 mag on 1999 September 15. The observed maximum was between two X-ray flares, that is, 12.1 hr after the X-ray sub-flare and
Makoto Uemura +5 more
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Second Timescale Photometry of the Very Fast Nova V1674 Her with Palomar Gattini-IR
Research Notes of the AAS, 2021 Abstract We report second-timescale infrared photometry of the nova V1674 Her using Palomar Gattini-IR (PGIR). These observations constitute the first infrared and highest temporal resolution data (resolution of ≈0.84 s) of the nova reported to date.
Kylie Y. Hansen +17 more
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