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Full-Text Articles in Physical Sciences and Mathematics
Outer-Disk Populations In Ngc 7793 : Evidence For Stellar Radial Migration., David J. Radburn-Smith, Rok Roskar, Victor P. Debattista, Julianne J. Dalcanton, David Streich, Roelof S. De Jong, Marija Vlajic, Benne W. Holwerda, Chris W. Purcell, Andrew E. Dolphin, Daniel B. Zucker
Outer-Disk Populations In Ngc 7793 : Evidence For Stellar Radial Migration., David J. Radburn-Smith, Rok Roskar, Victor P. Debattista, Julianne J. Dalcanton, David Streich, Roelof S. De Jong, Marija Vlajic, Benne W. Holwerda, Chris W. Purcell, Andrew E. Dolphin, Daniel B. Zucker
Faculty Scholarship
We analyzed the radial surface brightness profile of the spiral galaxy NGC 7793 using HST/ACS images from the GHOSTS survey and a new HST/WFC3 image across the disk break. We used the photometry of resolved stars to select distinct populations covering a wide range of stellar ages. We found breaks in the radial profiles of all stellar populations at 280 (∼5.1 kpc). Beyond this disk break, the profiles become steeper for younger populations. This same trend is seen in numerical simulations where the outer disk is formed almost entirely by radial migration. We also found that the older stars of …
The S4g Perspective On Circumstellar Dust Extinction Of Asymptotic Giant Branch Stars In M100., Sharon Meidt, Eva Schinnerer, Juan Carlos Munoz-Mateos, Benne W. Holwerda, Luis C. Ho, Barry F. Madore, Johan H. Knapen, Albert Bosma, E. Athanassoula, Joannah L. Hinz, Kartik Sheth, Michael Regan, Armando Gil De Paz, Karin Menendez-Delmestre, Mark Seibert, Taehyun Kim, Trisha Mizusawa, Dimitri A. Gadotti, Eija Laurikainen, Heikki Salo, Jarkko Laine, Sebastien Comeron
The S4g Perspective On Circumstellar Dust Extinction Of Asymptotic Giant Branch Stars In M100., Sharon Meidt, Eva Schinnerer, Juan Carlos Munoz-Mateos, Benne W. Holwerda, Luis C. Ho, Barry F. Madore, Johan H. Knapen, Albert Bosma, E. Athanassoula, Joannah L. Hinz, Kartik Sheth, Michael Regan, Armando Gil De Paz, Karin Menendez-Delmestre, Mark Seibert, Taehyun Kim, Trisha Mizusawa, Dimitri A. Gadotti, Eija Laurikainen, Heikki Salo, Jarkko Laine, Sebastien Comeron
Faculty Scholarship
We examine the effect of circumstellar dust extinction on the near-IR (NIR) contribution of asymptotic giant branch (AGB) stars in intermediate-age clusters throughout the disk of M100. For our sample of 17 AGB-dominated clusters we extract optical-to-mid-IR spectral energy distributions (SEDs) and find that NIR brightness is coupled to the mid-IR dust emission in such a way that a significant reduction of AGB light, of up to 1 mag in the K band, follows from extinction by the dust shell formed during this stage. Since the dust optical depth varies with AGB chemistry (C-rich or O-rich), our results suggest that …