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NOTE: Most of the High Level Science Products are unavailable while unscheduled maintenance is being performed. They will be incrementally restored over the course of this week. We apologize for any inconvenience.

A Comprehensive UV Spectral Linelist of White Dwarf G191-B2B

Preval et al. 2013, MNRAS, 436, 659

Fig. 1: Co-added spectrum from 48 FUSE observations (LWRS, MDRS, and HIRS).Fig. 2: Co-added spectrum from 98 STIS observations (E140H, E230H gratings).

Introduction

A team led by Simon Preval have created one of the most complete UV linelists of a white dwarf. Co-adding over 150 spectra from both HST STIS and FUSE, the team was able to identify nearly 950 absorption lines with equivalent widths as small as a few mÅ. They were able to identify every observed feature in the coadded FUSE spectrum, and nearly every feature in the coadded STIS spectrum. In addition to line identification, the team was able to measure abundances for 9 elements (C, N, O, Al, Si, P, S, Fe, Ni).

For full details of the data reduction, line identification, and analysis, we refer the reader to the original paper. At MAST, we provide the complete linelist, as well as the spectra (individual and coadded versions), as a High Level Science Product. The linelist is provided as an ASCII text table, while the spectra are in FITS format, as explained in the Data Format section below. An interactive plotting tool for users to explore these high quality white dwarf spectra is provided as links in the Atlas table below. Note that the HST STIS spectra did not have additional dispersion corrections as suggested by Ayres (2010) applied, but a future release may include versions of the spectra with these corrections.

Data Format

HST FITS

The FITS headers and data format of the HST HLSP files are summarized in this table (show / hide).

FUSE FITS

The FITS headers and data format of the FUSE HLSP files are summarized in this table (show / hide).

Linelist ASCII Tables

The columns of the ASCII linelist files are summarized in this table (show / hide).

Data Access And Interactive Plot Tool

Use the "plotter" links to visit the interactive plot tool and preview spectra (zoom, etc). Expand the table by clicking on the "Show Individual Spectra Rows" to see any of the spectra that went into the coadds. You can also download files through your browser or download a tarball (~77 MB) containing all of the FITS files and linelist catalogs.

The FUSE coadd spectrum has not been corrected for shifts in the individual segments. This has resulted in several line velocities deviating from the accepted values of Preval et al. (2013), who found the photospheric and two ISM components to have velocities of 23.8, 19.4, and 8.64 km/s respectively. According to Dobbie et al. (2005), the uncertainties in the absolute velocity uncertainty of FUSE spectra can be as large as 20km/s, which is in agreement with the largest velocity we found of > 30 km/s (see Table B1 in Preval et al. 2013).

HST E140H HST E230H FUSE
COADD
FITSLINELIST
PLOTTER COADD
FITSLINELIST
PLOTTER COADD
FITSLINELIST
PLOTTER
Show/Hide Individual Spectra

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