Zobrazeno 1 - 10
of 544
pro vyhledávání: '"Shara, Michael"'
Autor:
Shara, Michael M., Lanzetta, Kenneth M., Garland, James T., Valls-Gabaud, David, Gromoll, Stefan, Misiura, Mikita, Walter, Frederick M., Webb, John K., Martin, Barrett
Classical nova eruptions result from thermonuclear-powered runaways in, and ejection of, the hydrogen-rich envelopes of white dwarf stars accreted from their close binary companions. Novae brighten to up to 1,000,000 solar luminosities, and recur tho
Externí odkaz:
http://arxiv.org/abs/2410.12103
RX Pup is a symbiotic binary which experienced a nova outburst in the 1970's. Here we report a discovery of a ~1300 year old nova shell around the system and a possible detection of a ~7000 year old nova shell. Together with the nova shell ejected in
Externí odkaz:
http://arxiv.org/abs/2408.06523
Autor:
Shara, Michael M., Lanzetta, Kenneth M., Garland, James T., Gromoll, Stefan, Valls-Gabaud, David, Walter, Frederick M., Webb, John K., Kniazev, Alexei, Townsend, Lee, Darnley, Matthew J., Healy-Kalesh, Michael, Corral-Santana, Jesus, Schmidtobreick, Linda
Just 10 recurrent novae (RNe) - which erupt repeatedly on timescales shorter than one century - are known in our Galaxy. The most extreme RN known (located in the Andromeda galaxy), M31N 2008-12a, undergoes a nova eruption every year, and is surround
Externí odkaz:
http://arxiv.org/abs/2310.17055
Autor:
Shara, Michael M., Lanzetta, Kenneth M., Garland, James T., Gromoll, Stefan, Valls-Gabaud, David, Walter, Frederick M., Webb, John F., Zurek, David R., Brosch, Noah, Rich, R. Michael
The existence of a vast nova shell surrounding the prototypical dwarf nova Z Camelopardalis (Z Cam) proves that some old novae undergo metamorphosis to appear as dwarf novae thousands of years after a nova eruption. The expansion rates of ancient nov
Externí odkaz:
http://arxiv.org/abs/2310.00123
Autor:
Lanzetta, Kenneth M., Gromoll, Stefan, Shara, Michael M., Berg, Stephen, Garland, James, Mancini, Evan, Valls-Gabaud, David, Walter, Frederick M., Webb, John K.
We used the Condor Array Telescope to obtain deep imaging observations through the luminance filter of the entirety of the NGC 5866 Group, including a very extended region surrounding the galaxy NGC 5907 and its stellar stream. We find that the stell
Externí odkaz:
http://arxiv.org/abs/2309.17248
Autor:
Lessing, Alec M., Shara, Michael M., Hounsell, Rebekah, Mandel, Shifra, Feder, Nava, Sparks, William
The 135 classical novae that we have discovered in M87 with two $\textit{Hubble Space Telescope}$ imaging surveys appear to be strongly concentrated along that galaxy's jet. Detailed simulations show that the likelihood that this distribution occurre
Externí odkaz:
http://arxiv.org/abs/2309.16856
Autor:
Shara, Michael M., Lessing, Alec M., Hounsell, Rebekah, Mandel, Shifra, Zurek, David, Darnley, Matthew J., Graur, Or, Hillman, Yael, Meyer, Eileen T., Mikolajewska, Joanna, Neill, James D., Prialnik, Dina, Sparks, William
M87 has been monitored with a cadence of 5 days over a 9 month-long span through the near-ultraviolet (NUV:F275W) and optical (F606W) filters of the Wide Field Camera 3 (WFC3) of the $\textit{Hubble Space Telescope}$. This unprecedented dataset yield
Externí odkaz:
http://arxiv.org/abs/2308.15599
Autor:
Shara, Michael M., Howell, Steve B., Furlan, Elise, Garland, James T., Moffat, Anthony F. J., Zurek, David
Accurately quantifying the rates dM/dt at which massive stars lose mass is essential to any understanding of their evolution. All dM/dt estimates to date assume wind clumping factors; not allowing for clumping leads to overestimates of dM/dt and unde
Externí odkaz:
http://arxiv.org/abs/2308.07443
Autor:
Pledger, Joanne L., Shara, Michael M.
Stellar evolution theory predicts multiple pathways to the explosive deaths of stars as supernovae. Locating and characterizing the progenitors of well-studied supernovae is important to constrain the theory, and to justify and design future surveys
Externí odkaz:
http://arxiv.org/abs/2305.14447
Autor:
Lanzetta, Kenneth M., Gromoll, Stefan, Shara, Michael M., Berg, Stephen, Valls-Gabaud, David, Walter, Frederick M., Webb, John K.
The "Condor Array Telescope" or "Condor" is a high-performance "array telescope" comprised of six apochromatic refracting telescopes of objective diameter 180 mm, each equipped with a large-format, very low-read-noise ($\approx 1.2$ e$^-$), very rapi
Externí odkaz:
http://arxiv.org/abs/2301.06301