Results 21 to 30 of about 1,142,001 (295)
Star Product and Star Exponential [PDF]
, 2012 This paper introduces a family of star products, parameterized by the space of complex symmetric matrices. Let us recall that Omori-Maeda-Miyazaki-Yoshioka obtained a generalization of the well-known Moyal-Weyl product by means of complex symmetric matrices.
Tomihisa, Toshio, Yoshioka, Akira
openaire +4 more sources
Can massive Be/Oe stars be progenitors of long gamma ray bursts? [PDF]
, 2010 Context: The identification of long-gamma-ray-bursts (LGRBs) is still uncertain, although the collapsar engine of fast-rotating massive stars is gaining a strong consensus.
Ekstrom, Sylvia +3 more
core +6 more sources
Herbig Ae/Be Stars in the Magellanic Bridge [PDF]
, 2007 We have found Herbig Ae/Be star candidates in the western region of the Magellanic Bridge. Using the near infrared camera SIRIUS and the 1.4 m telescope IRSF, we surveyed about 3.0 deg x 1.3 deg (24 deg < RA < 36 deg, -75 deg < Dec. < -73.7 deg) in the J,
Akika Ishihara +23 more
core +3 more sources
Studying the UV Mg II Resonance Lines in 20 Be Stars
Open Astronomy, 2011 Using the GR model, we analyze the UV Mg II resonance lines in the spectra of 20 Be stars of different spectral subtypes, in order to detect the presence of satellite or discrete absorption components. The values of some physical parameters – rotational,
Antoniou A. +3 more
doaj +1 more source
Strong Variability in AzV 493, an Extreme Oe-type Star in the SMC
The Astrophysical Journal, 2023 We present 18 yr of OGLE photometry together with spectra obtained over 12 yr revealing that the early Oe star AzV 493 shows strong photometric (Δ I < 1.2 mag) and spectroscopic variability with a dominant, 14.6 yr pattern and ∼40 day oscillations.
M. S. Oey +13 more
doaj +1 more source
Optical spectroscopic variability of Herbig Ae/Be stars [PDF]
, 2011 We analysed 337 multi-epoch optical spectra of 38 Herbig Ae/Be (HAeBe) stars to gain insights into the variability behaviour of the circumstellar (CS) atomic gas.
A. Mora +60 more
core +2 more sources
The `bare' strange stars might not be bare [PDF]
, 1998 It is proposed that the `bare' strange matter stars might not be bare, and radio pulsars might be in fact `bare' strange stars. As strange matter stars being intensely magnetized rotate, the induced unipolar electric fields would be large enough to ...
Bodner A R +9 more
core +3 more sources
Reddening-Free Q Parameters to Classify B-Type Stars with Emission Lines
Galaxies, 2023 The emission-line B-type stars constitute a heterogeneous group. Many of these stars show similar optical spectroscopic features and color indices, making it difficult to classify them adequately by means of photometric and spectroscopic techniques. Thus,
Yael Aidelman, Lydia Sonia Cidale
doaj +1 more source
VLTI/MIDI observations of 7 classical Be stars [PDF]
, 2009 We measured the mid-infrared extension of the gaseous disk surrounding seven Be stars in order to constrain the geometry of their circumstellar environments and to try to infer physical parameters characterizing these disks.
A. Meilland +23 more
core +4 more sources
Long-term optical photometric monitoring of the FUor star V900 Mon [PDF]
Serbian Astronomical Journal, 2021 We present results from photometric monitoring of V900 Mon, one of the newly discovered and still under-studied object from the FU Orionis type. The FUor phenomenon is very rarely observed, but it is essential for stellar evolution.
Semkov E.H., Peneva S.P., Ibryamov S.I.
doaj +1 more source