On the Distance Measurements toward Young Milky Way Objects. I. Study of IC 2944

• Autorzy: Krełowski J. , Strobel A. , Godunova V. , Bondar A.

Identyfikatory

DOI

10.32023/0001-5237/67.4.6

• Języki publikacji: EN

Abstrakty

EN

We compare distances to a very young stellar aggregate, IC 2944, using three methods: direct parallaxes of Gaia, spectrophotometric parallax and our method based on intensities of interstellar CaII lines. The discrepancies between spectrophotometric distances and those, based on CaII K and H lines, were already reported. The interstellar CaII H and K lines allow one to determine both distances and radial velocities of the intervening clouds. Thus, these data allow us to check the aggregate membership. It is also possible to check the spectral classification of considered targets which is necessary for spectrophotometric parallaxes. Using three methods, we determined distances to IC 2944 stars. We demonstrate that CaII based distances agree very well with the kinematic ones but are generally much smaller than the spectrophotometric ones. We conclude that the majority of IC 2944 objects is obscured by clouds producing neutral ("gray") extinction which diminishes their brightness exactly like extended distances. This influences spectrophotometric parallaxes while those, based on the CaII lines, do not depend on extinction and this method seems to be the most reliable one inside the thin disk of our Galaxy. The Gaia trigonometric parallaxes lead to distances similar to those obtained using the CaII method if their errors are reasonably small.

Słowa kluczowe

EN

ISM: kinematics; ISM: dynamics; galaxy: disk; dust; extinction

• Wydawca: Copernicus Foundation for Polish Astronomy
• Czasopismo: Acta Astronomica
• Rocznik: 2017
• Tom: Vol. 67, No. 4
• Strony: 379--396
• Opis fizyczny: Bibliogr. 30 poz., rys., tab.

Twórcy

autor

Krełowski J.

• Toruń Centre for Astronomy, Nicolaus Copernicus University, Gagarina 11, 87-100 Toruń, Poland

autor

Strobel A.

• Toruń Centre for Astronomy, Nicolaus Copernicus University, Gagarina 11, 87-100 Toruń, Poland

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

Bibliografia

• Alter, G., Balazs, B., Ruprecht, J., and Vanysek, J. 1970, “Catalogue of Star Clusters and Associations”, Budapest: Akademiai Kiado 2nd ed., Eds. G. Alter, B. Balazs, J. Ruprecht.
• Ardeberg, A., and Maurice, E. 1980, A&AS, 39, 325.
• Ardeberg, A., and Maurice, E. 1981, A&A, 98, 9.
• Aumer, M., and Binney, J. J. 2009, MNRAS, 397, 1286.
• Baume, G., Rodriguez, M.J., Corti, M.A., Carraro, G., and Panei, J.A. 2014, MNRAS, 443, 411B.
• Fitzpatrick, E., and Massa, D. 2007, ApJ, 663, 320.
• Gaia Collaboration (Brown, A.G.A, et al. ) 2016, A&A, 595, 2.
• Galazutdinov, G.A., Strobel, A., Musaev, F.A., Bondar, A., and Krełowski, J. 2015, PASP, 127, 126.
• Greenberg, J.M. 1974, ApJ, 189, 81.
• Kharchenko, N.V., Piskunov, A.E., Roeser, S., Schilbach, E., and Scholz, R.-D. 2005, A&A, 438, 1163.
• Krełowski, J., and Westerlund, B. E. 1988, A&A, 190, 339K.
• Krełowski, J., Galazutdinov, G. A., Strobel, A., and Mulas, G. 2016, Acta Astron., 66, 469.
• McSwain, M. V., and Gies, D. R. 2005, ApJS, 161, 118.
• 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.
• Naze, Y., Rauw, G., Sana, H., and Corcoran, M.F. 2013, A&A, 555, A83.
• Papaj, J., Krelowski, J., and Wegner, W. 1993, A&A, 273, 575P.
• Perry, C. L., and Landolt, A. U. 1986, AJ, 92, 844.
• Sana, H., James, G., and Gosset, E. 2011, MNRAS, 416, 817.
• 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.
• Sofue, Y., Honma, M., and Omodaka, T. 2009, PASJ, 61, 227.
• Sota, A., Apellániz, J.M., Morrell, N.I., Barbá, R.H., Walborn, N.R., Gamen, R.C., Arias, J.I., and Alfaro, E.J. 2014, ApJS, 211, 10.
• Struve, O. 1928, ApJ, 67, 353.
• Thackeray, A.D., and Wesselink, A.J. 1965, MNRAS, 131, 121.
• Tody, D. 1993, ASP Conference Series, 52, 173.
• Tovmassian, H.M., Epremian, R.A., Hovhannessian, Kh., Cruz-Gonzalez, G., Navarro, S. G., and Karapetian, A.A. 1998, AJ, 115, 1083.
• Trumpler, R.J. 1930, PASP, 42, 214.
• Wang, S., Li, A., and Jiang, B.W. 2014, Planetary and Space Science, 100, 32.
• Wang, S., Li, A., and Jiang, B.W. 2015, ApJ, 811, 38.
• Wegner, W. 2003, Astron. Nachr., 324, 219.

Uwagi

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