40 citations · 148 across the 16 of their papers we have counts for
16 papers
A statistical framework for quantitative spectroscopy of luminous blue stars
Miguel A. Urbaneja
Context: Quantitative spectroscopy of luminous blue stars relies on detailed non-LTE model atmospheres whose increasing physical realism makes direct, iterative analyses computatio…
The IACOB project: XVI. Surface helium abundances in Galactic O-type stars: indications for identifying binary interaction products
S. Simón-Díaz, G. Holgado, C. Martínez-Sebastián +13
The presence of massive O-type stars with surfaces enriched by CNO-cycle products has been known since the early 1980s. For many years, internal rotational mixing was assumed to be…
Blue supergiants and the zero point of the Tully-Fisher relation: a path to a new independent test of the Hubble constant
Rolf-Peter Kudritzki, Fabio Bresolin, Miguel A. Urbaneka +1
Blue supergiant distances of nearby galaxies obtained with the flux-weighted gravity-luminosity relationship are used for a measurement of the zero points of Tully-Fisher relations…
Blue supergiants in the Pinwheel Galaxy M101: comparison with H II region chemical abundances, spectroscopic distance and an independent determination of the Hubble constant
Fabio Bresolin, Rolf-Peter Kudritzki, Miguel A. Urbaneja +2
We present a quantitative spectroscopic study of 13 blue supergiant stars in the Pinwheel Galaxy M101, based on data obtained with the Low Resolution Imaging Spectrometer available…
The IACOB project XIV. New clues on the location of the TAMS in the massive star domain
A. de Burgos, S. Simón-Díaz, M. A. Urbaneja +4
Massive stars play a very important role in many astrophysical fields. Yet, some fundamental aspects of their evolution remain poorly constrained. In this regard, there is an open…
Toward early-type eclipsing binaries as extragalactic milestones: IV. Physical properties of three detached O/B-type systems in the LMC
Mónica Taormina, G. Pietrzyński, R. -P. Kudritzki +10
We present a complete set of physical parameters for three early-type eclipsing binary systems in the Large Magellanic Cloud (LMC): OGLE LMC-ECL-17660, OGLE LMC-ECL-18794, and HV 2…
The Hubble constant anchor galaxy NGC 4258: metallicity and distance from blue supergiants
Rolf-Peter Kudritzki, Miguel A. Urbaneja, Fabio Bresolin +5
A quantitative spectroscopic study of blue supergiant stars in the Hubble constant anchor galaxy NGC 4258 is presented. The non-LTE analysis of Keck I telescope LRIS spectra yields…
The IACOB project XI. No increase of mass-loss rates over the bistability region
Abel de Burgos, Zsolt Keszthelyi, Sergio Simón-Díaz +1
The properties of blue supergiants are key for constraining the end of the main sequence (MS) of massive stars. Whether the observed drop in the relative number of fast-rotating st…
The IACOB project X. Large-scale quantitative spectroscopic analysis of Galactic luminous blue stars
Abel de Burgos, Sergio Simón-Díaz, Miguel A. Urbaneja +1
Blue supergiants (BSGs) are key objects for understanding the evolution of massive stars. However, discrepancies between theoretical predictions and empirical observations have ope…
Evidence for stellar mergers of evolved massive binaries: blue supergiants in the Large Magellanic Cloud
Athira Menon, Andrea Ercolino, Miguel A. Urbaneja +8
Blue supergiants are the brightest stars in their host galaxies and yet their evolutionary status has been a long-standing problem in stellar astrophysics. In this pioneering work,…
Low-frequency photospheric and wind variability in the early-B supergiant HD 2905
S. Simón-Díaz, C. Aerts, M. A. Urbaneja +5
Despite the important advances in space asteroseismology during the last decade, the early phases of evolution of stars with masses above 15 M have been only vaguel…
Extragalactic Supergiants
M. A. Urbaneja, R. P. Kudritzki
Blue supergiant stars of B and A spectral types are amongst the visually brightest non-transient astronomical objects. Their intrinsic brightness makes it possible to obtain high q…
PN fast winds: Temporal structure and stellar rotation
R. K. Prinja, D. L. Massa, M. A. Urbaneja +1
To diagnose the time-variable structure in the fast winds of central stars of planetary nebulae (CSPN), we present an analysis of P Cygni line profiles in FUSE satellite far-UV spe…
Are the Stellar Winds in IC1613 stronger than expected?
A. Herrero, M. Garcia, K. Uytterhoeven +8
In this poster we present the results of our analyses of three early massive stars in IC 1613, whose spectra have been observed with VIMOS and analyzed with CMFGEN and FASTWIND. On…
The dense and asymmetric central star wind of the young PN He 2-138
R. K. Prinja, S. E. Hodges, M. A. Urbaneja +1
We present optical ESO time-series and UV archival (FUSE, HST, IUE) spectroscopy of the H-rich central star of He 2-138. Our study targets the central star wind in a very young pla…
The Araucaria Project. The Distance to the Local Group Galaxy WLM from Near-Infrared Photometry of Cepheid Variables
W. Gieren, G. Pietrzynski, O. Szewczyk +5
We have obtained deep images in the near-infrared J and K filters for several fields in the Local Group galaxy WLM. We report intensity mean magnitudes for 31 Cepheids located in t…