Start year
2014
End year
2017
Organizational Unit
Organizing institutions
Grants related:
General
Description
IACOB is an ambitious long-term project whose main scientific goal is to provide an unprecedented empirical overview of the main physical properties of Galactic massive O- and B-type stars which can be used as definitive anchor point for our theories of stellar atmospheres, winds, interiors and evolution of massive stars
Members
Principal investigator
Sergio
Simón Díaz
Collaborators
Artemio
Herrero Davo
Dr.
KLAUS SIMON RUBKE ZUÑIGA
Dr.
INÉS CAMACHO IÑESTA
César
Esteban López
Dr.
Jesús Maíz Apellaniz
Dr.
Ignacio Negueruela
Dr.
Norberto Castro
Dr.
Miriam García
Dr.
Carolina Sabín-Sanjulian
Dr.
Javier Lorenzo
Dr.
Ricardo Dorda e
Prof.
Joachim Puls
Dr.
María Fernanda Nieva
Dr.
Jorge García-Rojas
Dr.
Conny Aerts
Dr.
Nevy Markova
Dr.
Miguel A. Urbaneja
Dr.
Rodolfo Barbá
Dr.
Julia Arias
Dr.
Nolan R. Walborn
Scientific activity
Related publications
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MEGARA: a new generation optical spectrograph for GTCMEGARA (Multi-Espectrógrafo en GTC de Alta Resolución para Astronomía) is an optical Integral-Field Unit (IFU) and Multi-Object Spectrograph (MOS) designed for the GTC 10.4m telescope in La Palma. MEGARA offers two IFU fiber bundles, one covering 12.5x11.3 arcsec2 with a spaxel size of 0.62 arcsec (Large Compact Bundle; LCB) and another oneGil de Paz, A. et al.
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72014 -
The B Fields in OB Stars (BOB) SurveyThe B fields in OB stars (BOB) survey is an ESO Large Programme collecting spectropolarimetric observations for a large number of early-type stars in order to study the occurrence rate, properties, and ultimately the origin of magnetic fields in massive stars. A total of 98 objects was observed over 20 nights with FORS2 and HARPSpol to July 2014Morel, T. et al.
Advertised on:
92014 -
The Cocoon nebula and its ionizing star: do stellar and nebular abundances agree?Context. Main-sequence massive stars embedded in an H ii region should have the same chemical abundances as the surrounding nebular gas+dust. The Cocoon nebula (IC 5146), a close-by Galactic H ii region ionized by a narrow line B0.5 V single star (BD+46 3474), is an ideal target to compare nebular and stellar abundances in detail in the sameGarcía-Rojas, J. et al.
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112014 -
The spectroscopic Hertzsprung-Russell diagram of Galactic massive starsThe distribution of stars in the Hertzsprung-Russell diagram narrates their evolutionary history and directly assesses their properties. Placing stars in this diagram however requires the knowledge of their distances and interstellar extinctions, which are often poorly known for Galactic stars. The spectroscopic Hertzsprung-Russell diagram (sHRD)Castro, N. et al.
Advertised on:
102014 -
The IACOB project. II. On the scatter of O-dwarf spectral type - effective temperature calibrationsContext. We are now in an era of large spectroscopic surveys of OB-type stars. Quantitative spectroscopic analysis of these modern datasets is enabling us to review the physical properties of blue massive stars with robust samples, not only revisiting mean properties and general trends, but also incorporating information about the effects of secondSimón-Díaz, S. et al.
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102014 -
On the use of the Fourier transform to determine the projected rotational velocity of line-profile variable B starsContext. The Fourier transform method is a popular tool for deriving the rotational velocities of stars from their spectral line profiles. However, its domain of validity does not include line-profile variables with time-dependent profiles. Aims: We investigate the performance of the method for such cases, by interpreting the line-profileAerts, C. et al.
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92014 -
Masgomas-4: Physical characterization of a double-core obscured cluster with a massive and very young stellar populationContext. The discovery of new, obscured massive star clusters has changed our understanding of the Milky Way star-forming activity from a passive to a very active star-forming machine. The search for these obscured clusters is strongly supported by the use of all-sky, near-IR surveys. Aims: The main goal of the MASGOMAS project is to search for andRamírez Alegría, S. et al.
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72014 -
Astrophysical parameters and orbital solution of the peculiar X-ray transient IGR J00370+6122Context. BD + 60° 73 is the optical counterpart of the X-ray source IGR J00370+6122, a probable accretion-powered X-ray pulsar. The X-ray light curve of this binary system shows clear periodicity at 15.7 d, which has been interpreted as repeated outbursts around the periastron of an eccentric orbit. Aims: We aim to characterise the binary systemKarpen, J. T. et al.
Advertised on:
62014 -
Sher 25: pulsating but apparently aloneThe blue supergiant Sher 25 is surrounded by an asymmetric, hourglass-shaped circumstellar nebula, which shows similarities to the triple-ring structure seen around SN 1987A. From optical spectroscopy over six consecutive nights, we detect periodic radial velocity variations in the stellar spectrum of Sher 25 with a peak-to-peak amplitude of ˜12 kmTaylor, W. D. et al.
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82014 -
The IACOB project. I. Rotational velocities in northern Galactic O- and early B-type stars revisited. The impact of other sources of line-broadeningContext. Stellar rotation is an important parameter in the evolution of massive stars. Accurate and reliable measurements of projected rotational velocities in large samples of OB stars are crucial to confront the predictions of stellar evolutionary models with observational constraints. Aims: We reassess previous determinations of projectedSimón-Díaz, S. et al.
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22014 -
A Be-type star with a black-hole companionStellar-mass black holes have all been discovered through X-ray emission, which arises from the accretion of gas from their binary companions (this gas is either stripped from low-mass stars or supplied as winds from massive ones). Binary evolution models also predict the existence of black holes accreting from the equatorial envelope of rapidlySimón-Díaz, S. et al.
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12014 -
Astrophysical parameters of the peculiar X-ray transient IGR J11215-5952Context. The current generation of X-ray satellites has discovered many new X-ray sources that are difficult to classify within the well-described subclasses. The hard X-ray source IGR J11215-5952 is a peculiar transient, displaying very short X-ray outbursts every 165 days. Aims: To characterise the source, we obtained high-resolution spectra ofHerrero, A. et al.
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22014 -
Spectroscopic and physical parameters of Galactic O-type stars. II. Observational constraints on projected rotational and extra broadening velocities as a function of fundamental parameters and stellar evolutionContext. Rotation is of key importance for the evolution of massive star, including their fate as supernovae or gamma-ray bursts. However, the rotational velocities of OB stars are difficult to determine. Aims: Based on our own data for 31 Galactic O stars and incorporating similar data for 86 OB supergiants from the literature, we aim atLanger, N. et al.
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22014 -
A High Angular Resolution Survey of Massive Stars in Cygnus OB2: Results from the Hubble Space Telescope Fine Guidance SensorsWe present results of a high angular resolution survey of massive OB stars in the Cygnus OB2 association that we conducted with the fine guidance sensor 1R (FGS1r) on the Hubble Space Telescope. FGS1r is able to resolve binary systems with a magnitude difference ΔV 4 down to separations as small as 0.''01. The sample includes 58 of the brighterJao, W.-C. et al.
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22014
