Results 21 to 30 of about 5,591,095 (382)

An Optically Discovered Outburst from XTE J1859+226

The Astrophysical Journal, 2023
Using the Zwicky Transient Facility, in 2021 February we identified the first known outburst of the black hole X-ray transient XTE J1859+226 since its discovery in 1999. The outburst was visible at X-ray, UV, and optical wavelengths for less than 20 days,
Eric C. Bellm, Yuankun Wang, Jan van Roestel, Rebecca A. Phillipson, Michael W. Coughlin, John A. Tomsick, Steven L. Groom, Brian Healy, Josiah Purdum, Ben Rusholme, Jesper Sollerman, Peter Bealo, Stefano Lora, Eddy Muyllaert, Ivo Peretto, Erik J. Schwendeman   +15 more
doaj   +1 more source

Parameters and Pulsation Constant of Cepheid

Particles, 2023
The analysis of fifty empirical period-radius relations and forty-three empirical period-luminosity relations is performed for the Cepheids. It is found that most of these relations have significant systematic errors.
Sergei V. Sinitsyn
doaj   +1 more source

A new study of the variable star population in the Hercules globular cluster (M13; NGC 6205)★ [PDF]

Monthly notices of the Royal Astronomical Society, 2019
We present the results from $VI$ CCD time-series photometry of the globular cluster M13 (NGC 6205). From the Fourier decomposition of the light curves of RRab and RRc stars we found an average metallicity of [Fe/H]zw = -1.58 $\pm$ 0.09.
D. Deras, A. Ferro, C. Lázaro, I. B. Fierro, J. Calderón, S. Muneer, S. Giridhar   +6 more
semanticscholar   +1 more source

Variable Star Classification Using Multi-View Metric Learning [PDF]

Monthly notices of the Royal Astronomical Society, 2019
Comprehensive observations of variable stars can include time domain photometry in a multitude of filters, spectroscopy, estimates of colour (e.g. U-B), etc.
K. Johnston, S. Caballero-Nieves, V. Petit, A. Peter, Rana Haber   +4 more
semanticscholar   +1 more source

A Luminous Red Supergiant and Dusty Long-period Variable Progenitor for SN 2023ixf [PDF]

Astrophysical Journal Letters, 2023
We analyze pre-explosion near- and mid-infrared (IR) imaging of the site of SN 2023ixf in the nearby spiral galaxy M101 and characterize the candidate progenitor star.
J. Jencson, J. Pearson, Emma R. Beasor, R. Lau, J. Andrews, K. Bostroem, Y. Dong 董, M. Engesser, S. Gomez, M. Guolo, E. Hoang, G. Hosseinzadeh, S. Jha, V. Karambelkar, M. Kasliwal, M. Lundquist, N. M. Meza Retamal, A. Rest, D. Sand, M. Shahbandeh, M. Shrestha, N. Smith, J. Strader, S. Valenti, Qinan Wang, Y. Zenati   +25 more
semanticscholar   +1 more source

A near infrared variable star survey in the Magellanic Clouds: The Small Magellanic Cloud data [PDF]

Monthly notices of the Royal Astronomical Society, 2018
A very long term near-infrared variable star survey towards the Large and Small Magellanic Clouds was carried out using the 1.4m InfraRed Survey Facility at the South African Astronomical Observatory.
Y. Ita, N. Matsunaga, T. Tanabé, Y. Nakada, D. Kato, T. Nagayama, C. Nagashima, M. Kurita, Y. Nakajima, P. Whitelock, J. Menzies, M. Feast, T. Nagata, M. Tamura, Hidehiko Nakaya Astronomical Institute, Graduate School of Science, T. University, A. Aoba, Aoba-ku, Sendai, Miyagi, Japan., D. O. Astronomy, School of Materials Science, T. U. O. Tokyo, Hongo, Bunkyo-ku, Tokyo, I. O. Astronomy, Mitaka, Center for Low Carbon Society Strategy, Japan Science, Technology Agency, S. Plaza, Yonban-cho, Chiyoda-ku, Department of Materials Science, Engineering, Kagoshima University, Korimoto, Kagoshima, D. O. Astrophysics, Nagoya University, Chikusa-ku, Nagoya, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto, Hitotsubashi University, Naka, Kunitachi, U. C. Town, Rondebosch, S. Africa, South African astronomical Observatory, Observatory, N. A. O. O. Japan, A. Center   +58 more
semanticscholar   +1 more source

Variable Outer Disk Shadowing around the Dipper Star RXJ1604.3–2130 [PDF]

Astrophysical Journal, 2018
Low brightness dips have recently been observed in images of protoplanetary disks, and they are believed to be shadows by the inner disk. We present VLT/SPHERE polarimetric differential imaging of the transition disk around the dipper star RX J1604.3 ...
Paola Pinilla, M. Benisty, M. Benisty, J. D. Boer, C. Manara, J. Bouvier, C. Dominik, C. Ginski, C. Ginski, R. Loomis, A. S. Aguilar   +10 more
semanticscholar   +1 more source

The EDGE-CALIFA survey: exploring the star formation law through variable selection [PDF]

Monthly notices of the Royal Astronomical Society, 2019
We present a multilinear analysis to determine the significant predictors of star formation in galaxies using the combined EDGE-CALIFA sample of galaxies.
B. Dey, E. Rosolowsky, Yixian Cao, A. Bolatto, S. Sánchez, D. Utomo, D. Colombo, V. Kalinova, T. Wong, L. Blitz, S. Vogel, Jason L. Loeppky, R. García-Benito   +12 more
semanticscholar   +1 more source

Variability in NGC 3201 Giant Stars

The Astronomical Journal, 2023
We present the analysis of 510 light curves in V and I bands of 255 giant stars in the globular cluster NGC 3201. Our aim is to expand the sample of new types of variables reported in a previous study. These variables show a short period ( P _V < 0.6 day)
C. C. Cortés, Á. Llancaqueo Albornoz, S. Villanova, J. A. Ahumada, C. Parisi   +4 more
doaj   +1 more source

Variable Stars [PDF]

Nature, 1886
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openaire   +2 more sources