Results 31 to 40 of about 14,460 (279)

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.
openaire   +4 more sources

A Hubble Space Telescope Survey for Novae in M87. I. Light and Color Curves, Spatial Distributions, and the Nova Rate [PDF]

, 2016
The Hubble Space Telescope has imaged the central part of M87 over a 10 week span, leading to the discovery of 32 classical novae (CNe) and nine fainter, likely very slow, and/or symbiotic novae.
Baltz, Edward A., Doyle, Trisha F., Lauer, Tod R., Madrid, Juan P., Mikołajewska, Joanna, Neill, J. D., Shara, Michael M., Welch, D. L., Zurek, David   +8 more
core   +3 more sources

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., Ishioka, R., Uemura, M., Starkey, D. R., Krajci, T.   +4 more
openaire   +2 more sources

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., Pavana, M., Kamath, U.S., Anupama, G.C., Walter, F.M.   +4 more
openaire   +2 more sources

A Hubble Space Telescope Survey for Novae in M87. II. Snuffing out the Maximum Magnitude–Rate of Decline Relation for Novae as a Non-standard Candle, and a Prediction of the Existence of Ultrafast Novae [PDF]

, 2017
The extensive grid of numerical simulations of nova eruptions from the work of Yaron et al. first predicted that some classical novae might significantly deviate from the Maximum Magnitude–Rate of Decline (MMRD) relation, which purports to characterize ...
Baltz, Edward A., Doyle, Trisha, Kovetz, Attay, Lauer, Tod R., Madrid, Juan P., Mikołajewska, Joanna, Neill, J. D., Prialnik, Dina, Shara, Michael M., Welch, D. L., Yaron, Ofer, Zurek, David   +11 more
core   +2 more sources

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., Rana, V., Page, K. L., Sokoloski, J., Harrison, F.   +4 more
openaire   +3 more sources

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., Esipov V. F., Komissarova G. V., Shenavrin V. I., Taranova O. G., Tatarnikov A. M., Tatarnikova A. A.   +6 more
doaj   +1 more source

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, Taichi Kato, Tsutomu Watanabe, Rod Stubbings, Berto Monard, Kawai Nobuyuki   +5 more
openaire   +1 more source

Nova light curves from the Solar Mass Ejection Imager (SMEI) - II. The extended catalogue [PDF]

, 2015
We present the results from observing nine Galactic novae in eruption with the Solar Mass Ejection Imager (SMEI) between 2004 and 2009. While many of these novae reached peak magnitudes that were either at or approaching the detection limits of SMEI, we ...
A. Buffington, A. W. Shafter, B. V. Jackson, Bode M. F., Buffington A., Clover J., D. Bewsher, D. J. Harman, D. L. Holdsworth, Darnley M. J., Darnley M. J., F. Surina, Gaposchkin C. H. P., Hachisu I., Helton L. A., Henden A., Hernanz M. ed Hameury J.-M., Hounsell R., Hounsell R., Hounsell R., Hounsell R. A., J. M. Clover, Liller W., Liller W., Lynch D. K., Lynch D. K., M. F. Bode, M. J. Darnley, McLaughlin D. B. ed Greenstein J. L., Munari U., Nakano S., Nakano S., Nakano S., Nakano S., Nakano S., Nishiyama K., P. P. Hick, Pereira A. J. S., Pojmanski G., R. Hounsell, S. Starrfield, Schaefer B. E., Schwarz G. J., Shafter A. W., Shafter A. W., Spreckley S., Surina F., Swierczynski E., Tarrant N. J., Tomov T., Walter F. M., Wesson R., Williams R., Wolf W. M., Yamaoka H., Yamaoka H., Yaron O.   +56 more
core   +2 more sources

Multifrequency Behaviour of Galactic and Extragalactic Novae [PDF]

, 2018
The outbursts of novae are among the strongest explosions in the Universe. The eruptions involve physical processes that span the whole electromagnetic spectrum, demanding multifrequency observations. The photometric and spectroscopic observations in the
Poggiani, Rosa
core   +2 more sources