On the Distance Measurements in the Thin Milky Way Disk

• Autorzy: Krełowski J. , Strobel A. , Galazutdinov G. A. , Musaev F. , Bondar A.

Identyfikatory

DOI

10.32023/0001-5237/68.3.7

• Języki publikacji: EN

Abstrakty

EN

We present a test how far the direct, trigonometric parallax measurements and those, based on interstellar CaII H and K lines lead to distances to OB stars similar to those, based on spectrophotometrically determined ones. For this we use relatively nearby objects where the extinction effects are negligible. A test is based on observations of interstellar CaII H and K lines, that determine distances, in spectra of bright, nearby objects, free of extinction effects. For these objects one can find also trigonometric parallaxes. CaII H and K lines are weak in spectra of nearby stars and thus measurable only in high S/N ratio spectra. Such spectra being at our disposal also allow us to check the spectral classification of our targets and thus to comment the observed differences between distances acquired using different methods. Using four methods, we determined distances to nearly fifty B0-5 type stars, practically free of any extinction effects. We demonstrate that direct, astrometric, CaII H and K and spectrophotometric distances agree reasonably well in the absence of substantial interstellar extinction and when spectral classification is reliable. Apparently the absolute magnitude calibration, provided by Schmidt-Kaler, appears to be correct.

Słowa kluczowe

EN

ISM: clouds; dust; extinction

• Wydawca: Copernicus Foundation for Polish Astronomy
• Czasopismo: Acta Astronomica
• Rocznik: 2018
• Tom: Vol. 68, No. 3
• Strony: 285--300
• Opis fizyczny: Bibliogr. 16 poz., tab., wykr.

Twórcy

autor

Krełowski J.

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

autor

Strobel A.

• Center for Astronomy, Nicholas Copernicus University, ul. Gagarina 11, 87-100 Toruń, Poland

autor

Galazutdinov G. A.

• Instituto 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

Musaev F.

• Special Astrophysical Observatory, Nizhnij Arkhyz, 369167, Russia
• Institute of Astronomy of the Russian AS, Pyatnitskaya st. 48, Moscow, 119017, Russia
• Terskol Branch of Institute of Astronomy of the Russian AS, Peak Terskol, 361605, Russia

autor

Bondar A.

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

Bibliografia

• Fitzpatrick, E. and Massa, D. 2007, ApJ, 663, 320.
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• Hunter, I., Smoker, J. V., Keenan, F. P., Ledoux, C., Jehin, E., Cabanac, R., Melo, C., and Bagnulo, S. 2006, MNRAS, 367, 1478.
• Krełowski, J., Galazutdinov, G.A., Strobel, A., and Mulas, G. 2016, Acta Astron., 66, 469.
• Krełowski, J., Galazutdinov, G.A., Godunova, V., and Bondar, A. 2018, MNRAS, submitted.
• Megier, A., Strobel, A., Bondar, A., Musaev F.A., Han Inwoo, Krełowski, J. and Galazutdinov G.A. 2005, ApJ, 634, 451.
• Megier, A., Strobel, A., Galazutdinov, J., and Krełowski J. 2009, A&A, 507, 833.
• Schmidt-Kaler Th. 1982, in: “Stars and Star Clusters” Landolt-Boernstein, Vol. 2, Eds. K. Schaifers, and H.H. Voight, Springer, Berlin Heidelberg New York.
• Sembach, K.R., and Danks, A.C. 1994, A&A, 289, 539.
• Skórzyński, W., Strobel, A., and Galazutdinov, G. A. 2003, A&A, 408, 297.
• Smoker, J.V., Keenan, F.P., and Fox, A.J. 2015, A&A, 582, 59.
• Struve, O. 1928, ApJ, 67, 353.
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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).