Unveiling Vela - Time Variability of Na I D lines in the Direction of the Vela Supernova Remnant

Abstract

High-resolution spectral profiles of Na I D lines from the interstellar medium towards 64 stars in the direction of the Vela supernova remnant are presented. This survey conducted mostly between 2011-12 complements an earlier survey of the same stars by Cha & Sembach done in the 1993-96 period. The interval of 15 to 18 years provides a base line to search for changes in the interstellar profiles. Dramatic disappearance of strong absorption components at low radial velocity is seen towards three stars - HD 63578, HD 68217, HD 76161 - over 15-18 years; HD 68217 and HD 76161 are associated with the Vela SNR but HD 63578 is likely associated with the wind bubble of g2 Velorum. The vanishing of these cold neutral clouds in the short time of 15 to 18 years needs some explanation. Other changes are seen in high-velocity Na D components.

26 pages, 20 figures, 7 tables, accepted in MNRAS

References in corpus (6)

• The High Angular Resolution Multiplicity of Massive Stars
• Monitoring the Variable Interstellar Absorption toward HD 219188 with HST/STIS
• Spatial and Temporal Variations in Interstellar Absorption toward HD 72127AB
• Interstellar absorptions and shocked clouds towards supernova remnant RX J0852.0-4622
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Cited by in corpus (4)

• Atomic and Ionized Microstructures in the Diffuse Interstellar Medium
• Temporal Variability of Interstellar Na I Absorption Toward The Monoceros Loop
• Unveiling Vela -- Variability of Interstellar Lines in the Direction of the Vela Supernova Remnant III. Na D and Ca II K
• High-velocity interstellar absorption associated with the supernova remnant W28