Equivalent Width of the Interstellar Na i D 1 and D 2 Absorption Lines for Stars with E ( B − V ) < 0.15

Maxted, Pierre F. L.

Abstract

New measurements of the equivalent width of the interstellar Na i D1 and D2 absorption lines for 62 bright B-type stars with E(B − V) < 0.15 are used to recalibrate the relation between these quantities in this low-reddening regime, and to quantify the scatter around this relation. Stars showing multiple components in their interstellar Na i lines clearly show a larger total equivalent width at the same E(B − V) than stars with a single interstellar Na i absorption lines. Semi-empirical relations are derived that allow for the reddening toward stars showing single interstellar Na i absorption lines to be estimated. Previous calibrations of this relation are typically found to underestimate E(B − V) for these stars.

Citation

Maxted, P. F. L. (2025). Equivalent Width of the Interstellar Na i D 1 and D 2 Absorption Lines for Stars with E ( B − V ) < 0.15. Research Notes of the American Astronomical Society, 9(6), 1-5. https://doi.org/10.3847/2515-5172/ade39b

• Journal Article Type: Article
• Acceptance Date: Jun 30, 2025
• Publication Date: 2025-06
• Deposit Date: Jun 25, 2025
• Publicly Available Date: Jun 25, 2025
• Journal: Research Notes of the AAS
• Print ISSN: 2515-5172
• Electronic ISSN: 2515-5172
• Publisher: American Astronomical Society
• Peer Reviewed: Peer Reviewed
• Volume: 9
• Issue: 6
• Article Number: 146
• Pages: 1-5
• DOI: https://doi.org/10.3847/2515-5172/ade39b
• Keywords: Interstellar line absorption, Interstellar reddening, Interstellar extinction
• Public URL: https://keele-repository.worktribe.com/output/1280975