Results 21 to 30 of about 5,204,122 (311)

Catching a star before explosion: the luminous blue variable progenitor of SN 2015bh [PDF]

Astronomy & Astrophysics, 2017
In this paper we analyse the pre-explosion spectrum of SN2015bh by performing radiative transfer simulations using the CMFGEN code. This object has attracted significant attention due to its remarkable similarity to SN2009ip in both its pre- and post ...
I. Boian, J. Groh
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

HD 66051, an eclipsing binary hosting a highly peculiar, HgMn-related star

Scientific Reports, 2017
HD 66051 is an eclipsing system with an orbital period of about 4.75 d that exhibits out-of-eclipse variability with the same period. New multicolour photometric observations confirm the longevity of the secondary variations, which we interpret as a ...
Ewa Niemczura, Stefan Hümmerich, Fiorella Castelli, Ernst Paunzen, Klaus Bernhard, Franz-Josef Hambsch, Krzysztof Hełminiak   +6 more
doaj   +1 more source

BM ERI - SR-TYPE VARIABLE STAR

Odessa Astronomical Publications, 2017
Based on 218 negatives from the Odessa plate collection, BM Eri is classified as an SRa-type star with a 565.d5 period; range in pv 6.m9 - 8.m5; spectrum gM6; more probable minimuma at JD 2439042, 2440183.4, 2446475.
I. S. Brukhanov
doaj   +1 more source

Using APASS and 2GSS for studying variable stars

EPJ Web of Conferences, 2017
The AAVSO Photometric All-Sky Survey (APASS) provides calibrated magnitudes in the range 7 < V < 17 for the entire sky, in the BVugriZsY bandpasses. While primarily designed for 0.02 mag calibration, it provides photometry over a many-year baseline, and ...
Henden Arne, Levine Stephen, Welch Doug, Terrell Dirk, Munari Ulisse, Smith Thomas   +5 more
doaj   +1 more source

On the irregular variations in the light curves of RY Vul

Odessa Astronomical Publications, 2018
The star RY Vul according General Catalogue of Variable Star (GCVS) is RR Lyr variable, but period and initial epoch are unknown. To determine these parameters the photometric observations during several seasons in 201 1-201 7 of the variable star RY Vul
S. N. Udovichenko, L. E. Keir
doaj   +1 more source

SN 2015bh: NGC 2770's 4th supernova or a luminous blue variable on its way to a Wolf-Rayet star? [PDF]

, 2016
Very massive stars in the final phases of their lives often show unpredictable outbursts that can mimic supernovae, so-called, "SN impostors", but the distinction is not always straigthforward.
C. Thöne, A. D. U. Postigo, A. D. U. Postigo, G. Leloudas, G. Leloudas, C. Gall, C. Gall, Z. Cano, Z. Cano, Keiichi Maeda, Keiichi Maeda, S. Schulze, S. Schulze, S. Schulze, S. Campana, K. Wiersema, J. Groh, J. D. L. Rosa, F. E. Bauer, F. E. Bauer, F. E. Bauer, D. Malesani, D. Malesani, J. Maund, N. Morrell, Y. Beletsky   +25 more
semanticscholar   +1 more source

GENERAL CATALOGUE OF VARIABLE STARS: CURRENT STATUS AND NEW NAME-LISTS

Odessa Astronomical Publications, 2010
A short history of variable-star catalogs is presented. After the second World War, the International Astronomical Union asked astronomers of the Soviet Union to become responsible for variable-star catalogs. Currently, the catalog is kept electronically
N. N. Samus, E. V. Kazarovets, N. N. Kireeva, E. N. Pastukhova, O. V. Durlevich   +4 more
doaj   +1 more source

Development of a Period Analysis Algorithm for Detecting Variable Stars in Time-Series Observational Data

Journal of Astronomy and Space Sciences, 2019
The purpose of this study was to develop a period analysis algorithm for detecting new variable stars in the time-series data observed by charge coupled device (CCD). We used the data from a variable star monitoring program of the CBNUO.
Kim, Dong-Heun, Kim, Yonggi, Yoon, Joh-Na, Im, Hong-Seo   +3 more
doaj   +1 more source

The pulsating variable star population in DDO210 [PDF]

, 2015
We have probed the pulsating variable star content of the isolated Local Group dwarf galaxy, DDO210 (Aquarius), using archival Advanced Camera for Surveys/$Hubble$ $Space$ $Telescope$ imaging in the F475W and F814W passbands.
A. Ordoñez, A. Sarajedini
semanticscholar   +1 more source