[PDF]    http://dx.doi.org/10.3952/lithjphys.47413

Open access article / Atviros prieigos straipsnis

Lith. J. Phys. 47, 531–534 (2007)


STUDY OF INTERSTELLAR EXTINCTION IN THE GALAXY USING LARGE PHOTOMETRIC DATA BASES*
J. Sūdžius and S. Raudeliūnas
Astronomical Observatory of Vilnius University, Čiurlionio 29, LT-03100 Vilnius, Lithuania
E-mail: jokubas.sudzius@ff.vu.lt

Received 20 June 2007; accepted 21 November 2007

The results of the study of variations of the interstellar extinction law in the visible to near infrared in the Milky Way band between galactic latitudes from –20◦ to +20◦ are presented. It is shown that a ratio of total-to-selective extinction, RV = AV /EB–V, varies roughly proportionally to the density of obscuring interstellar clouds. It is found that frequency distribution of the ratios RV is trimodal with peaks at 2.42, 2.81, and 3.14.
Keywords: interstellar extinction, Milky Way galaxy, stellar photometry
PACS: 97.10.Ri, 98.38.Cp
*The report presented at the 37th Lithuanian National Physics Conference, 11–13 June 2007, Vilnius, Lithuania.


DIDELIŲ FOTOMETRINIŲ DUOMENŲ BAZIŲ PANAUDOJIMAS TARPŽVAIGŽDINEI EKSTINKCIJAI GALAKTIKOJE TIRTI
J. Sūdžius, S. Raudeliūnas
Vilniaus universiteto Astronomijos observatorija, Vilnius, Lietuva

Ištyrinėtos tarpžvaigždinės ekstinkcijos dėsnio variacijos priklausomai nuo galaktinės ilgumos ir platumos. Rasta, kad daugiklis RV = AV /EB–V, apibūdinantis tarpžvaigždinės ekstinkcijos dėsnį, kinta maždaug proporcingai tarpžvaigždinių debesų tankiui. Pagal šio daugiklio verčių pasiskirstymą nustatytos trys charakteringos jo vertės: 2,42, 2,81 ir 3,14.


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