On the Relation between Interstellar Spectral Features and Reddening

• Autorzy: Krełowski J. , Galazutdinov G. , Godunova V. , Bondar A.

Identyfikatory

DOI

10.32023/0001-5237/69.2.4

• Języki publikacji: EN

Abstrakty

EN

It is well known that interstellar spectral features correlate with color excess E(B-V). This suggests that measuring intensities of these features allows one to estimate reddening of stars. The aim of this paper is to check how tight intensities of interstellar diffuse bands (DIBs) are related to the amount of extinction, measured using E(B-V). We have measured equivalent widths of the strongest DIBs (centered at λλ 5780.6 Å, 5797.0 Å, 6196.0 Å, 6379.3 Å, 6613.5 Å, and 8620 Å), as well as of CH (near 4300.3 Å) and CH+ (near 4232.5 Å) in high resolution, high S/N ratio échelle spectra from several spectrographs. The equivalent widths of the 8620 DIB in noisy spectra were measured using a template which was constructed using the high quality spectrum of BD+40 4220. DIB relations with the color excess in the range 0.1-2.0 mag were examined. Our analysis demonstrates that all the above mentioned interstellar spectral features (except for, perhaps, 6379 DIB) do correlate with E(B-V) relatively tightly (with the Pearson's correlation coefficient of 0.8+). Moreover, the observed scatter is apparently not caused by measurement errors but of physical origin. We present several examples where the strength ratios of a DIB/molecule to E(B-V) are different than the average.

Słowa kluczowe

EN

ISM: clouds; dust; extinction: ISM: molecules; ISM: lines and bands

• Wydawca: Copernicus Foundation for Polish Astronomy
• Czasopismo: Acta Astronomica
• Rocznik: 2019
• Tom: Vol. 69, No. 2
• Strony: 159--175
• Opis fizyczny: Bibliogr. 42 poz., tab., wykr.

Twórcy

autor

Krełowski J.

• Center for Astronomy, Nicholas Copernicus University, Gagarina 11, 87-100 Toruń, Poland
• Rzeszów University, al. T. Rejtana 16c, 35-959 Rzeszów, Poland

autor

Galazutdinov G.

• nstituto de Astronomia, Universidad Catolica del Norte, Av. Angamos 0610, Antofagasta, Chile
• Pulkovo Observatory, Pulkovskoe Shosse 65, Saint-Petersburg, Russia
• Special Astrophysical Observatory, Nizhnij Arkhyz, 369167, Russia

autor

Godunova V.

• ICAMER Observatory, NAS of Ukraine, 27 Acad. Zabolotnoho Str., 03143, Kyiv, Ukraine

autor

Bondar A.

• ICAMER Observatory, NAS of Ukraine, 27 Acad. Zabolotnoho Str., 03143, Kyiv, Ukraine

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020)