Galaxy rotation curve from classical Cepheids
نویسندگان
چکیده
منابع مشابه
Rotation of the outer disc from classical cepheids
Radial velocities and distances have been measured for a sample of 48 remote classical cepheids located in the outer disc of the Galaxy (1180 < l < 2740). The distances are determined from BVI photometry, with semi-empirical metallicity corrections calibrated on the Magellanic Clouds. Using these cepheids as tracers, the rotation curve of the disc is determined between R0 and 2R0. The result is...
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The 87 new 0 determinations were added to the existing sample of cepheids with known radial velocities, forming an extended sample of 278 galactic classical cepheids with reliable radial velocity and photometry. We then calculated distances for these objects through a Period-Luminosity-Colour relation due to Feast & Walker (1987). The position of the cepheids in the galactic disk as given by th...
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Using an outer rotation curve of the Galaxy, we explore the galactic constants and the mass of the Galaxy. We show that Θ0 of 200 km s −1 is more favorable than the IAU standard value of 220 km s, and also show that if Θ0 is smaller than 207 km s −1 the rotation curve beyond 2R0 is declining in Keplerian fashion. In the case of Θ0= 200 km s −1 and R0= 7.6 kpc, the total mass and the extent of t...
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321 Galactic fundamental-mode Cepheids with good B,V , and (in most cases) I photometry by Berdnikov et al. (2000) and with homogenized color excesses E(B−V) based on Fernie et al. (1995) are used to determine their period-color (P-C) relation in the range 0.4 < log P ∼ < 1.6. The agreement with colors from different model calculations is good to poor. – Distances of 25 Cepheids in open cluster...
متن کاملAre the Cepheids in Ic 4182 Different from Population I Cepheids in the Galaxy?
Recently, the Cepheids in the spiral galaxy IC 4182 have been in the spotlight due to their use as calibrators for th~ supern~va la d~sta~ce scale: In this process the distance to IC 4182 is obtained by applying the local PopulatIOn I perIod-lumInosity relatIOn to the IC 4182 Cepheid sample. But is it really appropriate to do so? W,e employ t~e technique of Fourier decomposition to compare the ...
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ژورنال
عنوان ژورنال: Astronomische Nachrichten
سال: 2019
ISSN: 0004-6337,1521-3994
DOI: 10.1002/asna.201913655