Massive luminous early type stars in the LMC

Gochermann, J.; Schmidt-Kaler, Th.

doi:10.1051/0004-6361:20020659

Cited by 4 publications

(3 citation statements)

References 21 publications

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“…By reddening we mean both the reddening values and the reddening law. There is good evidence in the literature that the LMC reddening law may differ from the Galactic one shortward of B (see, e.g., Gochermann & Schmidt-Kaler [27]). However, this is of little concern for us.…”

Section: Reddening Effectsmentioning

confidence: 99%

Calibration of the Distance Scale from Cepheids

Fouqué

Storm

Gieren

2003

Stellar Candles for the Extragalactic Distance Scale

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We have used the infrared surface brightness technique to obtain a new absolute calibration of the Cepheid PL relation in optical and near-infrared bands from improved data on Galactic stars. The infrared surface brightness distances to the Galactic variables are consistent with direct interferometric Cepheid distance measurements, and with the PL calibration coming from Hipparcos parallaxes of nearby Cepheids, but are more accurate than these determinations. We find that in all bands, the Galactic Cepheid PL relation appears to be slightly, but significantly steeper than the corresponding relation defined by the LMC Cepheids. Since the slope of our LMC Cepheid sample is clearly better defined than the one of the much smaller Galactic sample, we fit the LMC slopes to our Galactic calibrating Cepheid sample (which introduces only a small uncertainty) to obtain our final, adopted and improved absolute calibrations of the Cepheid PL relations in the VIWJHK bands. Comparing the absolute magnitudes of 10-day period Cepheids in both galaxies which are only slightly affected by the different Galactic and LMC slopes of the PL relation, we derive values for the LMC distance modulus in all these bands which can be made to agree extremely well under reasonable assumptions for both, the reddening law, and the adopted reddenings of the LMC Cepheids. This yields, as our current best estimate from Cepheid variables, a LMC distance modulus of 18.55 +- 0.06.Comment: to be published in: "Stellar Candles", Lecture Notes in Physics (http://link.springer.de/series/lnpp

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Section: Reddening Effectsmentioning

confidence: 99%

Calibration of the Distance Scale from Cepheids

Fouqué

Storm

Gieren

2003

Stellar Candles for the Extragalactic Distance Scale

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“…The extinction law depends on the nature and composition of interstellar dust grains. Therefore the law will vary depending on environment such as Galactic star forming regions or for different galaxies like the Large and Small Magellanic Clouds (Gochermann & Schmidt-Kaler 2002). Several investigations of the reddening law in the LMC show that the average LMC extinction curve does not differ from that of the Milky Way at wavelengths covered by B-, V -and I-equivalent filters (e.g., Koornneef & Code 1981;Nandy et al 1981;Fitzpatrick 1986;Sauvage & Vigroux 1991;Misselt et al 1999), but with differences appearing in the U band and for shorter wavelengths.…”

Section: Interstellar Reddeningmentioning

confidence: 99%

Pre-Main-Sequence Stellar Populations Across Shapley Constellation Iii. I. Photometric Analysis and Identification,

Gouliermis

Dolphin

Robberto

et al. 2011

ApJ

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We present our investigation of pre-main-sequence (PMS) stellar populations in the Large Magellanic Cloud (LMC) from imaging with Hubble Space Telescope WFPC2 camera. Our targets of interest are four starforming regions located at the periphery of the super-giant shell LMC 4 (Shapley Constellation III). The PMS stellar content of the regions is revealed through the differential Hess diagrams and the observed colormagnitude diagrams (CMDs). Further statistical analysis of stellar distributions along cross-sections of the faint part of the CMDs allowed the quantitative assessment of the PMS stars census, and the isolation of faint PMS stars as the true low-mass stellar members of the regions. These distributions are found to be well represented by a double Gaussian function, the first component of which represents the main-sequence field stars and the second the native PMS stars of each region. Based on this result, a cluster membership probability was assigned to each PMS star according to its CMD position. The higher extinction in the region LH 88 did not allow the unambiguous identification of its native stellar population. The CMD distributions of the PMS stars with the highest membership probability in the regions LH 60, LH 63 and LH 72 exhibit an extraordinary similarity among the regions, suggesting that these stars share common characteristics, as well as common recent star formation history. Considering that the regions are located at different areas of the edge of LMC 4, this finding suggests that star formation along the super-giant shell may have occurred almost simultaneously.

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“…This second SS Cyg sequence was included because it mimics rather well the overall observed light curves of DN candidates SHZ1, SHZ4 and SHZ6, though the latter two objects are still redder than the simulated DN. We regard this difference as minor because reddening does vary strongly, and on small spatial scales, across the LMC (Gochermann & Schmidt-Kaler 2002).…”

Section: Simulations Of Known Dwarf Novaementioning

confidence: 99%

Erupting Dwarf Novae in the Large Magellanic Cloud

2003

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We report the first likely detections of erupting dwarf novae (DNe) in an external galaxy: the Large Magellanic Cloud. Six candidates were isolated from approximately a million stars observed every second night over 11 nights with the Cerro Tololo Inter-American Observatory 8K Â 8K Mosaic2 CCD imager. Artificial dwarf nova and completeness tests suggest that we are seeing only the brightest of the LMC DNe, probably SS Cygni-like cataclysmic variables (CVs), but possibly SU UMa type cataclysmics undergoing superoutbursts. We derive crude but useful limits on the LMC DN surface density and on the number of DNe in the LMC. Many thousands of CVs in the Magellanic Clouds can be discovered and characterized with 8 m class telescopes.

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Massive luminous early type stars in the LMC

Cited by 4 publications

References 21 publications

Calibration of the Distance Scale from Cepheids

Calibration of the Distance Scale from Cepheids

Pre-Main-Sequence Stellar Populations Across Shapley Constellation Iii. I. Photometric Analysis and Identification,

Erupting Dwarf Novae in the Large Magellanic Cloud

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