منابع مشابه
The stellar content of the compact H II region Sh 2 - 88 B ? , ? ? , ? ? ?
We present a photometric study of the compact H ii region Sh2-88B and its associated stellar cluster. The positions and JHK magnitudes are obtained for 125 stars over an 80′′ × 80′′ field centered on the region. The region has two components, called Sh2-88B1 and Sh288B2. B1 is a compact cometary H ii region associated with a cluster containing several massive stars. The dominant exciting star, ...
متن کاملLINEAR PULSATION CHARACTERISTICS OF MIRA VARIABLE STARS
The linear adiabatic pulsation-periods of Mira variable stars have been derived. Approximately 2701[1]models were calculated for M = 0.7 MΘ to 2 MΘ stars with radii from 180 RΘ to 340 RΘ and luminosities from 2800 LΘ to 10,000 LΘ. The chemical composition of all models is (X,Z) = (0.7,0.02). From the result of this study, linear relations on Luminosity-Period-Mass relationship and luminosity-pe...
متن کاملSh 138 : a compact H II region excited by a very young cluster ? , ? ?
We present a photometric and spectroscopic study of the compact H ii region Sh 138 and its associated stellar cluster. The positions and BVRIJHK magnitudes are obtained for more than 400 stars over a field of about 4′ square centred on the H ii region. Sh 138 is excited by a cluster of young massive stars. At the cluster’s very centre are at least four O–B2 stars separated by less than 4′′. The...
متن کاملSequential star formation at the periphery of the H II regions Sh 217 and Sh 219 ⋆ ⋆ ⋆
The H regions Sh 217 and Sh 219 are textbook examples of a Strömgren sphere surrounded by an annular photodissociation region (PDR). The annular PDR is observed in both the 21 cm atomic hydrogen emission and the dust (PAH) emission near 8 μm (MSX Survey). An ultracompact radio continuum source is observed in the direction of the annular PDR, in both Sh 217 and Sh 219. JHK observations show t...
متن کاملThe Ionizing Stars of the Galactic Ultra – Compact H II Region G 45 . 45 + 0 . 06
Using the NIFS near–infrared integral–field spectrograph behind the facility adaptive optics module, ALTAIR, on Gemini North, we have identified several massive O–type stars that are responsible for the ionization of the Galactic Ultra– Compact H II region G45.45+0.06. The sources “m” and “n” from the imaging study of Feldt et al. (1998) are classified as hot, massive O–type stars based on thei...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2020
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/staa206