Interstellar absorption lines in the spectrum of the starburst galaxy NGC 1705

Details Interstellar absorption lines in the spectrum of the starburst galaxy NGC 1705 Interstellar absorption lines in the spectrum of the starburst galaxy NGC 1705

1998-06-01

arxiv.org/abs/astro-ph/9806020v1

Astronomy and Astrophysics

Astrophysics

21 pages, AASTeX, 8 separate Postscript figure files, To appear in Astronomical Journal, September 1998 issue

Scientific paper

10.1086/300524

I present a GHRS archival study of the interstellar absorption lines in the line-of-sight to the HI-rich starburst dwarf galaxy NGC 1705, in the 1170 to 1740A range at ~ 120 km/s resolution. The absorption features arising due to photospheric lines are distinctly different from the interstellar lines. The interstellar lines consist of three relatively narrow components at LSR velocities of -20, 260 and 540 km/s and include absorption by neutral atoms, singly ionized atoms and atoms in higher ionization states. The analysis presented in this paper consists of (1) a list of all interstellar absorption features with > 3 sigma significance and their measured equivalent widths and (2) plots of the lines in the various atomic species together with the results of non-linear least square fit profiles to the observed data and (3) unpublished 21-cm maps from the Wakker & van Woerden survey showing the large-scale HI distribution in the region near the NGC 1705 sightline and high velocity cloud HVC 487. Further, I report weak N I 1200A triplet absorption for the supershell component, which in the absence of dust depletion and ionization corrections implies a low N abundance. A low N abundance for the supershell is consistent with an interpretation of nucleosynthetic enrichment by time-delayed "primary" nitrogen production, the age estimate of 10 - 20 x 10^6 years for the central superstar cluster NGC 1705-1 (Heckman and Leitherer, 1997) and the underabundance of Fe reported by Sahu and Blades (1997).

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