- ID:
- ivo://CDS.VizieR/J/ApJS/224/4
- Title:
- GOSSS III. 142 additional O-type systems
- Short Name:
- J/ApJS/224/4
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- This is the third installment of the Galactic O-Star Spectroscopic Survey (GOSSS), a massive spectroscopic survey of Galactic O stars, based on new homogeneous, high signal-to-noise ratio, R~2500 digital observations selected from the Galactic O-Star Catalog. In this paper, we present 142 additional stellar systems with O stars from both hemispheres, bringing the total of O-type systems published within the project to 590. Among the new objects, there are 20 new O stars. We also identify 11 new double-lined spectroscopic binaries, 6 of which are of O+O type and 5 of O+B type, and an additional new tripled-lined spectroscopic binary of O+O+B type. We also revise some of the previous GOSSS classifications, present some egregious examples of stars erroneously classified as O-type in the past, introduce the use of luminosity class IV at spectral types O4-O5.5, and adapt the classification scheme to the work of Arias et al.
Number of results to display per page
Search Results
- ID:
- ivo://CDS.VizieR/J/A+A/532/A54
- Title:
- GRAMS carbon-star model grid
- Short Name:
- J/A+A/532/A54
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Synthetic spectra and photometry for the GRAMS carbon-star set of radiative transfer models is provided in FITS form. Also included are various stellar and dust shell parameters related to the models. For each model, a 130-wavelength spectrum for the bare photosphere and one for the star+dust spectrum are available. The fluxes are in F_nu (Jansky) and are computed at the LMC distance (distance modulus = 18.5mag). Synthetic photometry is computed for 34 narrow- and broad-band filters which, in order, are: U, B, V, I, J, H, Ks, IRAC3_6, IRAC4_5, IRAC5_8, IRAC8_0, MIPS24, MIPS70, MIPS160, AKARIN2, AKARIN3, AKARIN4, AKARIS7, AKARIS9W, AKARIS11, AKARIL15, AKARIL18W, AKARIL24, WISEW1, WISEW2, WISEW3 and WISEW4 (see the footnotes in the article for more about these filters). Please read the FITS header for more information on the data.
- ID:
- ivo://CDS.VizieR/J/A+A/557/A18
- Title:
- GRB 120815A afterglow spectra
- Short Name:
- J/A+A/557/A18
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the discovery of molecular hydrogen (H_2_), including the presence of vibrationally-excited H_2^*^_ in the optical spectrum of the afterglow of GRB 120815A at z=2.36 obtained with X-shooter at the VLT. Simultaneous photometric broad-band data from GROND and X-ray observations by Swift/XRT place further constraints on the amount and nature of dust along the sightline. The galactic environment of GRB 120815A is characterized by a strong DLA with would allow statistical studies, and, coupled with host follow-up and sub-mm spectroscopy, provide unprecedented insights into the process and conditions of star-formation at high redshift.
- ID:
- ivo://CDS.VizieR/J/A+A/564/A38
- Title:
- GRB 120327A afterglow VLT/X-shooter spectroscopy
- Short Name:
- J/A+A/564/A38
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present a study of the environment of the Swift long gamma-ray burst GRB 120327A at z~2.8 through optical spectroscopy of its afterglow. We analyzed medium-resolution, multi-epoch spectroscopic observations (R~7000-12000, corresponding to ~15-23km/s, S/N=15-30 and wavelength range 3000-25000{AA}) of the optical afterglow of GRB 120327A, taken with X-shooter at the VLT 2.13 and 27.65hr after the GRB trigger.
- ID:
- ivo://CDS.VizieR/J/A+A/646/A50
- Title:
- GRB 190829A/SN 2019oyw spectra
- Short Name:
- J/A+A/646/A50
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Gamma-ray burst (GRB) 190829A (z=0.0785) was detected by Fermi and Swift and also at very high energy (VHE) by the High-Energy Stereoscopic System (H.E.S.S.) telescopes. The prompt emission displayed two emission episodes separated by a quiescent gap of ~40s. We present the 10.4m Gran Telescopio CANARIAS (GTC) observations of the afterglow of GRB 190829A and its underlying supernova. We also compare GRB190829A to GRB180728A, a GRB with similar behaviour, and discuss the implications on underlying physical mechanisms producing these two GRBs. We present multi-band photometric data along with spectroscopic follow-up observations taken with the 10.4m GTC telescope. Together with the data from the prompt emission, the 10.4m GTC data are used to understand the emission mechanisms and possible progenitor. A detailed analysis of the multi-band observations of the afterglow requires the cooling frequency to pass between the optical and X-ray bands at early epochs. The afterglow then transitions to the underlying supernova (SN) 2019oyw, which dominates later on. Although the prompt emission temporal properties of GRB 190829A and GRB 180728A are similar, the two pulses are different in the spectral domain. We find that SN 2019oyw associated with GRB 190829A is powered by Ni decay and is a Type Ic-BL SN. The spectroscopic and photometric properties of this SN are consistent with those observed for SN 1998bw, but evolved earlier.
876. GRB 140506A spectra
- ID:
- ivo://CDS.VizieR/J/A+A/572/A12
- Title:
- GRB 140506A spectra
- Short Name:
- J/A+A/572/A12
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Gamma-ray burst (GRB) afterglows probe sightlines to star-forming regions in distant star-forming galaxies. Here we present a study of the peculiar afterglow spectrum of the z=0.889 Swift GRB 140506A. Our aim is to understand the origin of the very unusual properties of the absorption along the line of sight. We analyse spectroscopic observations obtained with the X-shooter spectrograph mounted on the ESO/VLT at two epochs 8.8h and 33h after the burst, and with imaging from the GROND instrument. We also present imaging and spectroscopy of the host galaxy obtained with the Magellan telescope.
- ID:
- ivo://CDS.VizieR/J/A+A/580/A139
- Title:
- GRB 130606A VLT/X-shooter spectroscopy
- Short Name:
- J/A+A/580/A139
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The reionisation of the Universe is a process that is thought to have ended around z~6, as inferred from spectroscopy of distant bright background sources, such as quasars (QSO) and gamma-ray burst (GRB) afterglows. Furthermore, spectroscopy of a GRB afterglow provides insight in its host galaxy, which is often too dim and distant to study otherwise. For the Swift GRB 130606A at z=5.913 we have obtained a high S/N spectrum covering the full optical and near-IR wavelength region at intermediate spectral resolution with VLT/X-Shooter. We aim to measure the degree of ionisation of the intergalactic medium (IGM) between z=5.02-5.84 and to study the chemical abundance pattern and dust content of its host galaxy. We estimated the UV continuum of the GRB afterglow using a power-law extrapolation, then measured the flux decrement due to absorption at Ly{alpha},{beta}, and {gamma} wavelength regions. Furthermore, we fitted the shape of the red damping wing of Ly{alpha}. The hydrogen and metal absorption lines formed in the host galaxy were fitted with Voigt profiles to obtain column densities. We investigated whether ionisation corrections needed to be applied.
- ID:
- ivo://CDS.VizieR/J/A+A/601/A83
- Title:
- GRB 140506A X-shooter spectra
- Short Name:
- J/A+A/601/A83
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the spectroscopic and photometric late-time follow-up of the host galaxy of the long-duration Swift {gamma}-ray burst GRB140506A at z=0.889. The optical and near-infrared afterglow of this GRB had a peculiar spectral energy distribution (SED) with a strong flux-drop at 8000{AA} (4000{AA} rest-frame) suggesting an unusually steep extinction curve. By analysing the contribution and physical properties of the host galaxy, we here aim at providing additional information on the properties and origin of this steep, non-standard extinction.We find that the strong flux-drop in the GRB afterglow spectrum at <8000{AA} and rise at <4000{AA} (observers frame) is well explained by the combination of a steep extinction curve along the GRB line of sight and contamination by the host galaxy light at short wavelengths so that the scenario with an extreme 2175{AA} extinction bump can be excluded. We localise the GRB to be at a projected distance of approximately 4kpc from the centre of the host galaxy. Based on emission-line diagnostics of the four detected nebular lines, H{alpha}, H{beta}, [OII] and [OIII], we find the host to be a modestly star forming (SFR=1.34+/-0.04M_{sun}_/yr) and relatively metal poor (Z=0.35^+0:15^_0.11_Z_{sun}_) galaxy with a large dust content, characterised by a measured visual attenuation of AV=1.74+/-0.41mag. We compare the host to other GRB hosts at similar redshifts and find that it is unexceptional in all its physical properties. We model the extinction curve of the host-corrected afterglow and show that the standard dust properties causing the reddening seen in the Local Group are inadequate in describing the steep drop. We thus conclude that the steep extinction curve seen in the afterglow towards the GRB is of exotic origin and is sightline-dependent only, further confirming that this type of reddening is present only at very local scales and that it is solely a consequence of the circumburst environment.
- ID:
- ivo://CDS.VizieR/J/A+A/659/A39
- Title:
- GRB190114C spectra and light curves
- Short Name:
- J/A+A/659/A39
- Date:
- 01 Mar 2022 09:36:26
- Publisher:
- CDS
- Description:
- We observed GRB190114C (redshift z=0.4245), the first gamma-ray burst (GRB) ever detected at TeV energies, at optical and near-infrared wavelengths with several ground-based telescopes and the Hubble Space Telescope, with the primary goal of studying its underlying supernova, SN 2019jrj. The monitoring spanned the time interval between 1.3 and 370 days after the burst, in the observer frame. We find that the afterglow emission can be modelled with a forward shock propagating in a uniform medium modified by time-variable extinction along the line of sight. A jet break could be present after 7 rest-frame days, and accordingly the maximum luminosity of the underlying supernova (SN) ranges between that of stripped-envelope core-collapse SNe of intermediate luminosity and that of the luminous GRB-associated SN 2013dx. The observed spectral absorption lines of SN 2019jrj are not as broad as in classical GRB SNe and are instead more similar to those of less-luminous core-collapse SNe. Taking the broad-lined stripped-envelope core-collapse SN 2004aw as an analogue, we tentatively derive the basic physical properties of SN 2019jrj. We discuss the possibility that a fraction of the TeV emission of this source might have had a hadronic origin and estimate the expected high-energy neutrino detection level with IceCube.
- ID:
- ivo://CDS.VizieR/J/A+A/607/A107
- Title:
- GRB 080810 Keck/HIRES spectrum
- Short Name:
- J/A+A/607/A107
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We reveal multiple components of an interacting galaxy system at z~3.35 through a detailed analysis of the exquisite high-resolution Keck/HIRES spectrum of the afterglow of a gamma-ray burst (GRB). Through Voigt-profile fitting of absorption lines from the Lyman-series, we constrain the neutral hydrogen column density to N_HI_<=10^18.35^cm^-2^ for the densest of four distinct systems at the host redshift of GRB 080810, among the lowest NHI ever observed in a GRB host, despite the line of sight passing within a projected 5kpc of the galaxy centres. By detailed analysis of the corresponding metal absorption lines, we derive chemical, ionic and kinematic properties of the individual absorbing systems, and thus build a picture of the host as a whole. Striking differences between the systems imply that the line of sight passes through several phases of gas: the star-forming regions of the GRB host; enriched material in the form of a galactic outflow; the hot and ionised halo of a second, interacting galaxy falling towards the host at a line-of-sight velocity of 700km/s; and a cool, metal-poor cloud which may represent one of the best candidates yet for the inflow of metal-poor gas from the intergalactic medium.
