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Wednesday, May 13, 2020 | History

3 edition of IUE observations of luminous blue star associations in irregular galaxies found in the catalog.

IUE observations of luminous blue star associations in irregular galaxies

IUE observations of luminous blue star associations in irregular galaxies

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Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, D.C.?, Springfield, Va .
Written in English

    Subjects:
  • Stars -- Formation

  • Edition Notes

    Other titlesA comparison of star formation characteristics in different types of irregular galaxies
    StatementS.A. Lamb, D.A. Hunter, J.S. Gallagher, III
    SeriesNASA-TM -- 88779, NASA technical memorandum -- 88779
    ContributionsHunter, D. A, Gallagher, J. S, United States. National Aeronautics and Space Administration
    The Physical Object
    FormatMicroform
    Pagination[4] p.
    ID Numbers
    Open LibraryOL14984778M

    The spectra were found to contain lines with P Cygni profiles and were compared to η Carinae. In , Roberta M. Humphreys published a study of eight variables in M31 and M33 (excluding Var A) and referred to them as luminous blue variables, as well as making the link to the S Doradus class of variable stars. Luminous infrared galaxies or LIRGs are galaxies with luminosities, the measurement of brightness, above 10 11 L ☉.They are also referred to as submillimeter galaxies (SMGs) through their normal method of detection. LIRGs are more abundant than starburst galaxies, Seyfert galaxies and quasi-stellar objects at comparable luminosity. Infrared galaxies emit more energy in the infrared than at.

    Irr II galaxies are distorted and strange looking. Their appearance leads some astronomers to think that Irr II galaxies may have collided with another galaxy at some time during their lives. If you live south of the Equator, you may be able to see two irregular type galaxies in your night sky. Variable stars are generally analysed using photometry, spectrophotometry and ements of their changes in brightness can be plotted to produce light regular variables, the period of variation and its amplitude can be very well established; for many variable stars, though, these quantities may vary slowly over time, or even from one period to the : Robert A. Heinlein & Spider Robinson.

    Get this from a library! Luminous stars and associations in galaxies: proceedings of the th Symposium of the International Astronomical Union, held at Porto heli, Greece, May , [Camiel W H de Loore; A J Willis; Paul Laskarides; International Astronomical Union. Symposium].   Irregular galaxies are non-symmetric. They have ragged or irregular shapes and are generally small, much smaller than the Milky Way in size. .


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IUE observations of luminous blue star associations in irregular galaxies Download PDF EPUB FB2

Two regions of recent star" formation in blue irregular galaxies have been observed with the IUE in the short wavelength, low dispersion mode. The spectra indicate that the massive star content is similar in these regions and is best6fit by massive stars formed in a burst and now approximately x10 years old.

INTRODUCTION Ir'reguJar galaxies offer a special opportunity for the study of massive star. Get this from a library. IUE observations of luminous blue star associations in irregular galaxies. [S A Lamb; D A Hunter; J S Gallagher; United States. National Aeronautics and Space Administration.].

IUE Observations of Luminous Blue Star Associations in Irregular Galaxies Lamb, S. Pub Date: May Bibcode: NASCPL Keywords: Chronology; Galactic Evolution; Irregular Galaxies; Morphology; Spatial Distribution; Star Formation; Stellar Mass; B Stars;Author: S.

Lamb, D. Hunter, J. Gallagher. Two regions of recent star formation in blue irregular galaxies were observed with the IUE in the short wavelength, low dispersion mode.

The spectra indicate that the massive star content is similar in these regions and is best fit by massive stars formed in a burst. SAO/NASA Astrophysics Data System (ADS) Title: IUE observations of luminous blue star associations in irregular galaxies Authors: Lamb, S.

A., Hunter, D. A., & Gallagher, J. S., III Journal: Star formation in galaxies, Proceedings of a conference at the California Institute of Technology, Pasadena, California, JuneEdited by Carol J. Lonsdale Persson, p (SEE N87. Observations of extragalactic objects with IUE are discussed.

Elliptical galaxies show the presence of very hot stars which are probably highly evolved horizontal branch objects, although the observations are not adequate to rule out young OB : J.

Oke. UV-optical study of star forming galaxies for some years. Calzetti, Kinney and co-workers have extensively used the IUE spectra of star-forming galaxies complemented with op-tical and IR data to characterize the star formation history and the extinction occurring in the central regions of these ob.

GR (M 33 V = Romano’s Star) is a unique variable star in the M33 galaxy, which simultaneously displays variability typical for luminous blue variable (LBV) stars and physical parameters typical for nitrogen-rich Wolf-Rayet (WR) stars (WN).

As of now, GR is the first object which is confidently classified as a post-LBV star. Star Formation in Two Luminous Spiral Galaxies Deidre A. Hunter1, Bruce G. Elmegreen2, Vera C.

Rubin3, Allison Ashburn1;4, Teresa Wright1 ;5, Gyula I. J o and Christian Struve ABSTRACT We have examined star formation in two very luminous (M V = 22 to 23) Sc-type spiral galaxies, NGC and UGCusing ultra-deep H images. LUMINOUS GALAXIES. One of the most important discoveries from extragalactic observations at mid- and far-infrared wavelengths has been the identification of a class of "Luminous Infrared Galaxies" (LIGs), objects that emit more energy in the infrared (~ µm) than at all other wavelengths combined (see [] for a comprhensive review).The first all-sky survey at far-infrared wavelengths.

The shapes that are formed bear a remarkable resemblance to some type II irregular galaxies actually observed. The simulation also shows regions where star formation is triggered by the compression of gas in the objects. The red regions signify high rates of star formation, whilst blue areas are less intense.

Two regions of recent star formation in blue irregular galaxies have been observed with the 1UE Jn the short wavelength, low dispersion mode. The spectra indicate that the massive star content is similar in these regions and is best fit by massive stars formed in a burst and now approximately x10° years old.

INTRODUCTION. We present the results of a study of the internal kinematics of luminous star-forming galaxies in the 0 blue galaxies that cause. Mapping Luminous Blue Compact Galaxies with VIRUS-P: morphology, line ratios and kinematics Article (PDF Available) in Astronomy and Astrophysics September with 69 Reads.

mixed in with lots of gas and dust. These galaxies often have active regions of star formation. Sometimes the irregular shape of these galaxies results from interactions or collisions between galaxies. Observations such as the Hubble Deep Fields show that irregular galaxies were more common in the distant (early) Size: KB.

(, September 26). The notorious luminous blue variable star: New, three-dimensional simulations reveal the inner workings of one of the universe's most mysterious stars. ScienceDaily. A detailed study of the blue supergiant UIT (BIa+) in M33 is presented.

The results of our quantitative spectral analysis indicate that the star is a very luminous (logL/L ∼ dex) and massive (M ∼ 50M) object, showing a very high nitrogen-to-oxygen. Irregular galaxies often appear disorganized, and many are undergoing relatively intense star formation activity.

They contain both young population I stars and old population II stars. The two best-known irregular galaxies are the Large Magellanic Cloud and Small Magellanic Cloud (Figure 6), which are at a distance of a little more than. Observations of Distant Galaxies; we know that it must have many hot, luminous blue stars, and that star formation must have taken place in the few million years before the light left the galaxy.

In a yellow or red galaxy, on the other hand, the young, luminous blue stars that surely were made in the galaxy’s early bursts of star. By combining computer simulations with multi-band observations, two new studies examine how luminosity, star formation, dust heating, and other effects evolve during a galaxy collision.

Nearly thirty years ago the Infrared Astronomy Satellite discovered that the universe contained many tremendous.

Part I. IUE ATLASES and CATALOGUES BY CATEGORY. HOT STARS; Publication: Principal Author: galaxies: Star Formation in Blue: Compact Galaxies: Interstellar Extinction stars: Lyman-Emission in Star-Hartmann: blue galaxies: Forming Galaxies ``primeval'' galaxies: IUE Observations of LMC: Nandy: O, B supergiants: Members: An.

Galaxies can be found by themselves, in small groups and in large clusters. It is very rare to find stars in the space in between galaxies. Galaxies sometimes collide with each other, with interesting results.

These collisions can trigger bursts of star-formation in addition to changing the shapes of the galaxies that collide. Luminous blue variables are massive, evolved stars that exhibit large variations in luminosity and size on timescales from months to years, with Cited by: 7.