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Rocket Spectroscopy of Zeta Puppis

1970; IOP Publishing; Volume: 160; Linguagem: Inglês

10.1086/150455

1538-4357

Andrew M. Smith,

Astro and Planetary Science

view Abstract Citations (48) References (13) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Rocket Spectroscopy of Zeta Puppis Smith, Andrew M. Abstract A spectrum of Pup extending from 920 to 1360 A with approximately 0.8 A resolution has been recorded at rocket altitudes. Tentative identification of 102 multiplets of both stellar and interstellar origin has been made, from which it is concluded that all lines included in existing model atmospheres have been detected with the exception of those masked by telluric N2 or strong P Cygni-type profiles. Additional weak absorption lines indicate a wide range of ionization and excitation entirely consistent with observations in the visible spectral region of stars of similar type; they also appear to affect sensibly the energy distribution within the spectrum. Transitions in C iii (1176 A), N iii (990, 992 A), N iv (955 A), N v (1239,1243 A), 0 iv (1339, 1343 A), 0 vi (1032,1038 A), and S vi (933, 944 A) have been observed as P Cygni profiles. Except for the S vi lines, the mean radial velocities associated with ground-state transitions and the transition from the lowest triplet state in C iii are close to an average velocity of 1770 km the mean radial velocities of the N iv and 0 iv ions are 530 and 150 km , respectively. These results suggest a positive velocity gradient in the observed portion of the circumsteliar envelope, and they also suggest that the escaping ions are loosely bound together with essentially no difference in their average acceleration away from the star. The interstellar columnar density of atomic hydrogen was found to be (7.6 1 2.5) X 10' , the quoted uncertainty being due only to the uncertainty in establishing the continuum. The mean atom density becomes (6.4 1 2.1) x 10-2 if an interstellar distance through atomic hydrogen of 390 pc is assumed. Publication: The Astrophysical Journal Pub Date: May 1970 DOI: 10.1086/150455 Bibcode: 1970ApJ...160..595S full text sources ADS | data products SIMBAD (4)