- ID:
- ivo://CDS.VizieR/VI/102
- Title:
- Geneva stellar evolution tracks and isochrones
- Short Name:
- VI/102
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- This database was created from an updated version of the empirically and semi-empirically calibrated BaSeL library of synthetic stellar spectra of Lejeune et al. (1997, Cat. <J/A+AS/125/229>, 1998, Cat. <J/A+AS/130/65>) and Westera et al. (1999, ASP Conference Series 192, 203-206) to calculate synthetic photometry in the (UBV)_J_(RI)_C_ JHKLL'M, HST-WFPC2, Geneva, and Washington systems for the entire set of non-rotating Geneva stellar evolution models covering masses from 0.4-0.8 to 120-150M_{sun}_ and metallicities Z=0.0004 (1/50Z_{sun}_) to 0.1 (5Z_{sun}_). The results are provided in a database which includes all individual stellar tracks and the corresponding isochrones covering ages from 10^3^yr to 16-20Gyr in time steps of {Delta}logt=0.05dex. The database also includes a new grid of stellar tracks of very metal-poor stars (Z=0.0004) from 0.8-150M_{sun}_ calculated with the Geneva stellar evolution code. The complete stellar grids are tabulated in the files table1.dat (summary), evol.dat (evolutionary models), and in the files ubv.dat, hst.dat, gen.dat and cmt.dat (synthetic colors in the different photometric systems). These grids are also available as mod* files in subdirectories evol, ubv, hst, gen and cmt. The isochrones for the different photometric systems are summarized in the file table2.dat; the parameters of the isochrones are tabulated in the file iso.dat, the detailed isochrones being available as files iso* in the subdirectories ubv, hst, gen and cmt.
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Search Results
- ID:
- ivo://CDS.VizieR/J/A+A/509/A14
- Title:
- Grid of solar-metallicity wind models
- Short Name:
- J/A+A/509/A14
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Knowing how the mass loss of carbon-rich AGB stars depends on stellar parameters is crucial for stellar evolution modelling, as well as for the understanding of when and how circumstellar structures emerge around these stars, e.g., dust shells and so-called detached shells of expelled gas. The purpose of this paper is to explore the stellar parameter space using a numerical radiation hydrodynamic (RHD) model of carbon-star atmospheres, including a detailed description of dust formation and frequency-dependent radiative transfer, in order to determine how the mass loss of carbon stars changes with stellar parameters.
- ID:
- ivo://CDS.VizieR/J/A+AS/98/523
- Title:
- Grids of stellar models. II.
- Short Name:
- J/A+AS/98/523
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Continuing the effort to provide a homogeneous base of extensive and accurate grids of stellar models covering a wide range of metallicities we present a new grid of stellar models at metallicity Z = 0.008, roughly corresponding to the Large Magellanic Cloud composition. The models have been computed for 0.8 to 120 solar masses, using up-to-date input physics and the new radiative opacities from Rogers and Iglesias (1992ApJS...79..507R) and Kurucz (1991). Mass loss and moderate core overshooting are taken into account. The resulting HR diagram and the lifetimes in the H-, He-, and C-burning phases as well as some general results on massive stars are discussed and compared with complementary grids, using the same input physics at metallicities Z of 0.020 and 0.001 used by Schaller et al. (1992, Cat. J/A+AS/96/269)
- ID:
- ivo://CDS.VizieR/J/A+AS/101/415
- Title:
- Grids of stellar models III.
- Short Name:
- J/A+AS/101/415
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Stellar evolutionary models with mass loss and moderate overshooting at metallicity Z = 0.004 in the 0.80 to 120 M{sun} range are presented. They complete the set of grids computed with the same up-input physics for Z=0.020 and 0.001 by Schaller et al. (1992, Cat. J/A+AS/96/269), for Z=0.008 by Schaerer et al. (1992A&A...263..129S, Cat. J/A+AS/98/523) and for Z=0.040 by Schaerer et al. (1993, Cat. J/A+AS/102/339).
- ID:
- ivo://CDS.VizieR/J/A+AS/102/339
- Title:
- Grids of stellar models IV
- Short Name:
- J/A+AS/102/339
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The present grid of evolutionary sequences at metallicity Z=0.040, completes the set of grids computed for Z=0.020 and 0.001 by Schaller et al. (1992, Cat. J/A+AS/96/269), Z=0.008 by Schaerer et al. (1992, Cat. J/A+AS/98/523) and Z=0.004 by Charbonnel et al. (1993, Cat. J/A+AS/101/415). The models with mass loss and moderate core overshooting have been computed for 0.8 to 120 M{sun} using up-to-date input physics and the new radiative opacities from Iglesias et al. (1992ApJ...397..717I) and Kurucz (1991).
- ID:
- ivo://CDS.VizieR/J/A+AS/103/97
- Title:
- Grids of stellar models V.
- Short Name:
- J/A+AS/103/97
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Most outputs of massive star evolution critically depend on the mass loss rates. In order to broaden the comparison basis and to illustrate the effects of different mass loss rates, we have computed new sets of models, with initial masses between 12 and 120 M{sun}, and metallicities, Z, between 0.001 and 0.040, with a mass loss rate increased by a factor of two during the phases when the stellar winds are believed to be essentially driven by the radiation pressure. A moderate core-overshooting and the new radiative opacities from Iglesias et al. (1992ApJ...397..717I) and Kurucz (1991) were taken into account. These models complete the homogeneous and extended theoretical database formed by the previous grids of this series, computed by Schaller et al. (1992, Cat. J/A+AS/96/269) for Z=0.020 and Z=0.001, by Schaerer et al. (1992, Cat. J/A+AS/98/523; 1993, Cat. J/A+AS/102/339) for Z=0.008 and Z=0.040 and by Charbonnel et al. (1993, Cat. J/A+AS/101/415) for Z=0.004. This paper closes this series. Of particular interest is the predicted behaviour of metal rich stars such as may be found in the inner regions of our Galaxy. New evolutionary connexions are found, in particular we show that the most massive and metal rich stars may spend a relatively long time as He and N enriched stars and may even end their evolution as white dwarfs.
- ID:
- ivo://CDS.VizieR/J/A+AS/128/471
- Title:
- Grids of stellar models. VII.
- Short Name:
- J/A+AS/128/471
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present a new grid of stellar models from 0.8 to 60M_{sun}_ at Z=0.10, with mass loss and moderate overshooting, from the zero age main sequence to either the helium flash (low mass stars), the early AGB phase (intermediate-mass stars or the end of carbon burning (massive stars). The calculations are done with opacities provided by Iglesias & Rogers (1993ApJ...412..752I), completed by those of Alexander & Ferguson (1994ApJ...437..879A) at low temperatures. This grid is a homogeneous extension to very high metallicity of the previous grids published by the Geneva group. It is useful for the study of galactic bulges, elliptical galaxies and eventually quasars. Calculations of stars more massive than 60M_{sun}_ are not presented as these objects lose almost their entire mass during their main sequence phase, and are likely to end their life as white dwarfs.
- ID:
- ivo://CDS.VizieR/J/A+AS/135/405
- Title:
- Grids of stellar models. VIII.
- Short Name:
- J/A+AS/135/405
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present stellar evolutionary models covering the mass range from 0.4 to 1M_{sun}_ calculated for metallicities Z=0.020 and 0.001 with the MHD equation of state (Hummer & Mihalas, 1988ApJ...331..794H, Mihalas et al., 1988ApJ...331..815M, Daeppen et al., 1988ApJ...332..261D). A parallel calculation using the OPAL (Rogers et al., 1996ApJ...456..902R) equation of state has been made to demonstrate the adequacy of the MHD equation of state in the range of 1.0 to 0.8M_{sun}_ (the lower end of the OPAL tables). Below, down to 0.4M_{sun}_, we have justified the use of the MHD equation of state by theoretical arguments and the findings of Chabrier & Baraffe (1997A&A...327.1039C). We use the radiative opacities by Iglesias & Rogers (1996ApJ...464..943I), completed with the atomic and molecular opacities by Alexander & Fergusson (1994ApJ...437..879A). We follow the evolution from the Hayashi fully convective configuration up to the redgiant tip for the most massive stars, and up to an age of 20Gyr for the less massive ones. We compare our solar-metallicity models with recent models computed by other groups and with observations.
- ID:
- ivo://CDS.VizieR/J/A+A/565/A109
- Title:
- Herschel/PACS spectra of 48 evolved stars
- Short Name:
- J/A+A/565/A109
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present 48 Herschel/PACS spectra of evolved stars in the wavelength range of 67-72um. This wavelength range covers the 69mu band of crystalline olivine (Mg_2-2x_Fe_(2x)_SiO_4_). The width and wavelength position of this band are sensitive to the temperature and composition of the crystalline olivine. Our sample covers a wide range of objects: from high mass-loss rate AGB stars (OH/IR stars, dM/dt>=10^-5^M_{sun}_/yr), through post-AGB stars with and without circumbinary disks, to planetary nebulae and even a few massive evolved stars. The goal of this study is to exploit the spectral properties of the 69um band to determine the composition and temperature of the crystalline olivine. Since the objects cover a range of evolutionary phases, we study the physical and chemical properties in this range of physical environments. We fit the 69um band and use its width and position to probe the composition and temperature of the crystalline olivine. For 27 sources in the sample, we detected the 69um band of crystalline olivine (Mg_2-2x_Fe_(2x)_SiO_4_). The 69um band shows that all the sources produce pure forsterite grains containing no iron in their lattice structure. The temperature of the crystalline olivine as indicated by the 69um band, shows that on average the temperature of the crystalline olivine is highest in the group of OH/IR stars and the post-AGB stars with confirmed Keplerian disks. The temperature is lower for the other post-AGB stars and lowest for the planetary nebulae. A couple of the detected 69um bands are broader than those of pure magnesium-rich crystalline olivine, which we show can be due to a temperature gradient in the circumstellar environment of these stars. The disk sources in our sample with crystalline olivine are very diverse. They show either no 69um band, a moderately strong band, or a very strong band, together with a temperature for the crystalline olivine in their disk that is either very warm (~600K), moderately warm (~200K), or cold (~120K), respectively.
- ID:
- ivo://CDS.VizieR/J/ApJ/867/167
- Title:
- High-mass outflows from the COHRS CO(3-2) survey
- Short Name:
- J/ApJ/867/167
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- An unbiased search of molecular outflows within the region of the CO High Resolution survey has identified 157 high-mass outflows from a sample of 770 APEX Telescope Large Area Survey of the Galaxy clumps with a detection rate of 20%. The detection rate of outflows increases for clumps with higher M_clump_, L_bol_, L_bol_/M_clump_,N_H2_, and T_dust_ compared to the clumps with no outflow. The detection rates of the outflow increase from protostellar (8%) to young stellar object clump (17%) to massive star-forming clump (29%). The detection rate 26% for quiescent clump is preliminary, because the sample of quiescent clumps is small. A statistical relation between the outflow and clump masses for our sample is log(M_out_/M_{sun}_)=(-1.1+/-0.21)+(0.9+/-0.07)log(M_clump_/M_{sun}_). The detection rate of outflows and the outflow mass-loss rate show an increase with increasing M_clump_, L_bol_, N_H_2_, and T_dust_, which indicates that clumps with outflow with higher parameter values are at a more advanced evolutionary stage. The outflow mechanical force increases with increasing bolometric luminosities. No clear evidence has yet been found that higher-mass outflows have different launching conditions than low-mass outflows.
