Results 1 to 10 of about 199,506 (277)

Deconstructing the Characteristics of the Ionized Gas Component in Planetary Nebulae From Their Internal Motions

Frontiers in Astronomy and Space Sciences, 2022
The internal motions of the ionized gas in the shells of planetary nebulae (PNe) have served as relevant diagnostic tools to understand the development of this important stage of stellar evolution.
J. A. López
doaj   +1 more source

Photometric Activity of the Symbiotic Star CH Cyg During 2008–2011

Open Astronomy, 2012
We present results of UBVRC observations of the symbiotic star CH Cyg before and after optical and X-ray bursts in 2009 at various timescales. Rapid variability was found only during a strong burst (U ~ 9.5 mag) in 2009 October, while during the low ...
Shugarov S., Kolotilov E., Komissarova G., Skopal A., Zemko P.   +4 more
doaj   +1 more source

Are sdAs helium core stars?

Open Astronomy, 2017
Evolved stars with a helium core can be formed by non-conservative mass exchange interaction with a companion or by strong mass loss. Their masses are smaller than 0.5 M⊙. In the database of the Sloan Digital Sky Survey (SDSS), there are several thousand
Pelisoli Ingrid, Kepler S. O., Koester Detlev   +2 more
doaj   +1 more source

Visual Binaries in the Orion Nebula Cluster

, 2007
We have carried out a major survey for visual binaries towards the Orion Nebula Cluster using HST images obtained with an H-alpha filter. Among 781 likely ONC members more than 60" from theta-1 Ori C, we find 78 multiple systems (75 binaries and 3 ...
Baraffe I., Bo Reipurth, Couteau P., Duchene G., Duquennoy A., Durisen R. H., Heggie D. C., Herbig G. H., John Bally, Kroupa P., Kroupa P., Marcelo M. Guimarães, Michael S. Connelley, Poveda A., Reipurth B., Sterzik M. F.   +15 more
core   +1 more source

BEER analysis of Kepler and CoRoT light curves. III. Spectroscopic confirmation of seventy new beaming binaries discovered in CoRoT light curves

, 2015
(abridged for arXiv) The BEER algorithm searches stellar light curves for the BEaming, Ellipsoidal, and Reflection photometric modulations that are caused by a short-period companion. Applying the search to the first five long-run center CoRoT fields, we
Faigler, Simchon, Mazeh, Tsevi, Tal-Or, Lev   +2 more
core   +1 more source

Jet X-Ray Properties of EXO 1846-031 During Its 2019 Outburst

Universe
The Galactic X-ray transient EXO 1846-031 was first discovered during an outburst in 1985 by the EXOSAT mission. The source remained in a quiescent state for nearly 34 years after the first outburst. The source started its second outburst on 23 July 2019.
Riya Bhowmick, Sujoy Kumar Nath, Dipak Debnath, Hsiang-Kuang Chang   +3 more
doaj   +1 more source

Dynamics of massive stellar black holes in young star clusters and the displacement of ultra-luminous X-ray sources

, 2011
In low-metallicity environments, massive stars might avoid supernova explosion and directly collapse, forming massive (~25-80 solar masses) stellar black holes (MSBHs), at the end of their life.
Begelman, Belczynski, Belczynski, Brandt, Brandt, Bresolin, Böker, Colpi, Copperwheat, E. Ripamonti, Fragos, Freitag, Fryer, Fryer, Gaburov, Gelatt, Gonçalves, Grisé, Gualandris, Gürkan, Heger, Heger, Heggie, Heggie, Irwin, Kaaret, Kaaret, Kennicutt, King, King, King, King, Kulkarni, L. Zampieri, Linden, M. Colpi, M. Mapelli, Madhusudhan, Mapelli, Mapelli, Mapelli, Mapelli, Mapelli, Miller, Miller, Mushotzky, Patruno, Pilyugin, Portegies, Portegies, Portegies, Portegies, Poutanen, Prialnik, Rappaport, Rasio, Roberts, Salpeter, Sepinsky, Sigurdsson, Socrates, Soria, Stobbart, Swartz, Swartz, Swartz, Tauris, van der Marel, Vink, Winter, Zampieri, Zampieri, Zezas, Zuo   +73 more
core   +1 more source

Eclipsing Binaries From the CSTAR Project at Dome A, Antarctica [PDF]

, 2015
The Chinese Small Telescope ARray (CSTAR) has observed an area around the Celestial South Pole at Dome A since 2008. About $20,000$ light curves in the i band were obtained lasting from March to July, 2008. The photometric precision achieves about 4 mmag
Ashley, M. C. B., Bayliss, D., Fan, Zhou, Feng, Long-Long, Gong, Xuefei, Lawrence, J. S., Liang, Ensi, Liu, Hui-Gen, Liu, Qiang, Luong-Van, D. M., Ma, Jun, Meng, Zeyang, Storey, J. W. V., Tinney, Chris, Wang, Lifan, Wang, Lingzhi, Wang, Songhu, Wang, Ying, Wittenmyer, R. A., Wu, Donghong, Wu, Zhenyu, Yan, Jun, Yang, Huigen, Yang, Ji, Yang, Ming, Yu, Zhouyi, Yuan, Xiangyan, Zhang, Hui, Zhang, Tianmeng, Zhou, Ji-Lin, Zhou, Xu, Zhu, Zhenxi, Zou, Hu   +32 more
core   +2 more sources

The BSN Application-I: Photometric Light Curve Solutions of Contact Binary Systems

Galaxies
Light curve analysis of W UMa-type contact binary systems using MCMC or MC methods can be time-consuming, primarily because the repeated generation of synthetic light curves tends to be relatively slow during the fitting process.
Ehsan Paki, Atila Poro, Minoo Dokht Moosavi Rowzati   +2 more
doaj   +1 more source

An additional pulsating mode (7.35 mHz) and pulsations timing variations of PG 1613+426

Open Astronomy, 2017
We present the detection of an additional pulsation mode (7.35 mHz) of a subdwarf B star, PG 1613+426, and periodic Observed minus Calculated (O-C) variations for two existing pulsations. PG 1613+426 is near the hot end of the sdB instability strip.
Otani Tomomi, Oswalt Terry D., Majewski Patrice, Jordan Riley, Amaral Marc, Moss Adam   +5 more
doaj   +1 more source