A photometric study of the integrated light of clusters in the Magellanic Clouds and the Fornax dwarf galaxy

1973 ◽  
Vol 181 ◽  
pp. 641 ◽  
Author(s):  
I. J. Danziger
Keyword(s):  
Dwarf Galaxy ◽  
Magellanic Clouds ◽  
Photometric Study

scholarly journals Neutron-Capture Element Abundances in Planetary Nebulae

Galaxies ◽  
2020 ◽  
Vol 8 (2) ◽  
pp. 50
Author(s):  
N. C. Sterling
Keyword(s):  
Neutron Capture ◽  
Observational Studies ◽  
Near Infrared ◽  
Dwarf Galaxy ◽  
Planetary Nebulae ◽  
Slow Neutron ◽  
Magellanic Clouds ◽  
Heavy Elements ◽  
Element Abundances ◽  
Open Questions

Nebular spectroscopy is a valuable tool for assessing the production of heavy elements by slow neutron(n)-capture nucleosynthesis (the s-process). Several transitions of n-capture elements have been identified in planetary nebulae (PNe) in the last few years, with the aid of sensitive, high-resolution, near-infrared spectrometers. Combined with optical spectroscopy, the newly discovered near-infrared lines enable more accurate abundance determinations than previously possible, and provide access to elements that had not previously been studied in PNe or their progenitors. Neutron-capture elements have also been detected in PNe in the Sagittarius Dwarf galaxy and in the Magellanic Clouds. In this brief review, I discuss developments in observational studies of s-process enrichments in PNe, with an emphasis on the last five years, and note some open questions and preliminary trends.

A Photometric Study of Two OB Associations in the Magellanic Clouds

1986 ◽  
Vol 98 ◽  
pp. 1102
Author(s):  
C. D. Garmany ◽  
P. Massey ◽  
K. de Gioia-Eastwood
Keyword(s):  
Magellanic Clouds ◽  
Photometric Study ◽  
Ob Associations

scholarly journals Spectroscopy of Red Giants of the Sagittarius Dwarf Galaxy

1999 ◽  
Vol 192 ◽  
pp. 129-135
Author(s):  
G. Marconi ◽  
P. Bonifacio ◽  
L. Pasquini ◽  
P. Molaro
Keyword(s):  
Star Formation ◽  
Radial Velocity ◽  
Dwarf Galaxy ◽  
Spectral Synthesis ◽  
Radial Velocities ◽  
Red Giants ◽  
Photometric Study ◽  
Ccd Photometry

The photometric study of the Sagittarius dwarf galaxy by Marconi et al. (1998) has suggested the presence of a spread in metallicity (-0.7 ≤ [Fe/H] ≤ −1.6), which may result from different bursts of star formation. We present the results from a Multi Object Slit spectroscopy program carried out at the NTT with the aim to determine spectroscopic abundances of Sagittarius giants selected from the CCD photometry. From our intermediate resolution (R~1500) spectra, radial velocities are determined to confirm the membership and metallicities are derived by using spectral synthesis codes for stars down to V ~ 18, i.e. below the RGB clump. Out of 57 observed stars, 23 have a radial velocity consistent with Sagittarius membership; here we present results for 8 of these. No star with [Fe/H]< −1.0 is found, three stars are found to be metal-rich.

scholarly journals B[e]-Stars of the Magellanic Clouds

1986 ◽  
Vol 116 ◽  
pp. 265-267
Author(s):  
F.-J. Zickgraf ◽  
B. Wolf ◽  
O. Stahl ◽  
C. Leitherer
Keyword(s):  
Magellanic Clouds ◽  
Emission Lines ◽  
Absorption Lines ◽  
Circumstellar Dust ◽  
Photometric Study

We carried out a spectroscopic and photometric study of the 8 presently known B[e] -stars of the Magellanic Clouds (MC), i. e. R4 and R50 of the SMC, R66, R82, R126, Hen S12, Hen S22 and Hen S134 of the LMC. These stars are characterized by the following typical properties: a) strong Balmer emission lines, frequently with P Cygni profiles, b) permitted and forbidden emission lines predominantly of Fe II, [Fe II], [O I] etc., c) strong IR excess due to circumstellar dust. Photospheric absorption lines are usually weak or even not detectable.

A photometric study of 11 massive stars in the Magellanic Clouds

2005 ◽  
Vol 326 (8) ◽  
pp. 725-730
Author(s):  
A. M. van Genderen ◽  
C. Sterken
Keyword(s):  
Massive Stars ◽  
Magellanic Clouds ◽  
Photometric Study

scholarly journals APOGEE Chemical Abundance Patterns of the Massive Milky Way Satellites

2021 ◽  
Vol 923 (2) ◽  
pp. 172
Author(s):  
Sten Hasselquist ◽  
Christian R. Hayes ◽  
Jianhui Lian ◽  
David H. Weinberg ◽  
Gail Zasowski ◽  
...  
Keyword(s):  
Star Formation ◽  
Chemical Evolution ◽  
Milky Way ◽  
Dwarf Galaxy ◽  
Magellanic Clouds ◽  
Chemical Abundance ◽  
Element Abundances ◽  
Abundance Patterns ◽  
Galaxy Environment ◽  
Red Giant

Abstract The SDSS-IV Apache Point Observatory Galactic Evolution Experiment (APOGEE) survey has obtained high-resolution spectra for thousands of red giant stars distributed among the massive satellite galaxies of the Milky Way (MW): the Large and Small Magellanic Clouds (LMC/SMC), the Sagittarius Dwarf Galaxy (Sgr), Fornax (Fnx), and the now fully disrupted Gaia Sausage/Enceladus (GSE) system. We present and analyze the APOGEE chemical abundance patterns of each galaxy to draw robust conclusions about their star formation histories, by quantifying the relative abundance trends of multiple elements (C, N, O, Mg, Al, Si, Ca, Fe, Ni, and Ce), as well as by fitting chemical evolution models to the [α/Fe]–[Fe/H] abundance plane for each galaxy. Results show that the chemical signatures of the starburst in the Magellanic Clouds (MCs) observed by Nidever et al. in the α-element abundances extend to C+N, Al, and Ni, with the major burst in the SMC occurring some 3–4 Gyr before the burst in the LMC. We find that Sgr and Fnx also exhibit chemical abundance patterns suggestive of secondary star formation epochs, but these events were weaker and earlier (∼5–7 Gyr ago) than those observed in the MCs. There is no chemical evidence of a second starburst in GSE, but this galaxy shows the strongest initial star formation as compared to the other four galaxies. All dwarf galaxies had greater relative contributions of AGB stars to their enrichment than the MW. Comparing and contrasting these chemical patterns highlight the importance of galaxy environment on its chemical evolution.

scholarly journals A search for star clusters in the outskirts of the Large Magellanic Cloud: indication of clusters in the age gap

2020 ◽  
Vol 499 (3) ◽  
pp. 4114-4139
Author(s):  
M Gatto ◽  
V Ripepi ◽  
M Bellazzini ◽  
M Cignoni ◽  
M-R L Cioni ◽  
...  
Keyword(s):  
Dwarf Galaxy ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Magellanic Clouds ◽  
Stellar Clusters ◽  
System A ◽  
Age Gap ◽  
History Of ◽  
Interaction History ◽  
Insight Into

ABSTRACT The YMCA (Yes, Magellanic Clouds Again) and STEP (The SMC in Time: Evolution of a Prototype interacting late-type dwarf galaxy) projects are deep g, i photometric surveys carried out with the VLT Survey Telescope (VST) and devoted to study the outskirts of the Magellanic System. A main goal of YMCA and STEP is to identify candidate stellar clusters and complete their census out to the outermost regions of the Magellanic Clouds. We adopted a specific overdensity search technique coupled with a visual inspection of the colour–magnitude diagrams to select the best candidates and estimate their ages. To date, we analysed a region of 23 square degrees in the outskirts of the Large Magellanic Cloud, detecting 85 candidate cluster candidates, 16 of which have estimated ages falling in the so-called age gap. We use these objects together with literature data to gain insight into the formation and interaction history of the Magellanic Clouds.

Novae in the Magellanic Clouds

1979 ◽  
Vol 46 ◽  
pp. 96-101
Author(s):  
J.A. Graham
Keyword(s):  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Magellanic Clouds ◽  
University Of Michigan ◽  
The Past ◽  
Spectroscopic Information ◽  
Objective Prism ◽  
The University ◽  
Small Cloud ◽  
Low Dispersion

During the past several years, a systematic search for novae in the Magellanic Clouds has been carried out at Cerro Tololo Inter-American Observatory. The Curtis Schmidt telescope, on loan to CTIO from the University of Michigan is used to obtain plates every two weeks during the observing season. An objective prism is used on the telescope. This provides additional low-dispersion spectroscopic information when a nova is discovered. The plates cover an area of 5°x5°. One plate is sufficient to cover the Small Magellanic Cloud and four are taken of the Large Magellanic Cloud with an overlap so that the central bar is included on each plate. The methods used in the search have been described by Graham and Araya (1971). In the CTIO survey, 8 novae have been discovered in the Large Cloud but none in the Small Cloud. The survey was not carried out in 1974 or 1976. During 1974, one nova was discovered in the Small Cloud by MacConnell and Sanduleak (1974).

Sign in / Sign up

Export Citation Format

Share Document