Spatiokinematic models of five nova remnants: correlations between nova shell axial ratio, expansion velocity, and speed class
Por:
Santamaria, E., Guerrero, M. A., Zavala, S., Ramos-Larios, G., Toala, J. A., Sabin, L.
Publicada:
24 mar 2022
Resumen:
We present long-slit intermediate-dispersion spectroscopic observations
and narrow-band direct imaging of four classical nova shells, namely T
Aur, HR Del, DQ Her, and QU Vul, and the nova-like source CK Vul. These
are used to construct models of their nebular remnants using the
morphokinematic modelling tool shape to reveal their 3D shape. All these
nova remnants but CK Vul can be described by prolate ellipsoidal shells
with different eccentricity degree, from the spherical QU Vul to the
highly elongated shell with an equatorial component HR Del. On the other
hand, CK Vul shows a more complex structure, with two pairs of nested
bipolar lobes. The spatiokinematic properties of the ellipsoidal nova
shells derived from our models include their true axial ratios. This
parameter is expected to correlate with the expansion velocity and
decline time t(3) (i.e. their speed class) of a nova as the result the
interaction of the ejecta with the circumstellar material and rotation
speed and magnetic field of the white dwarf. We have compared these
three parameters including data available in the literature for another
two nova shells, V533 Her and FH Ser. There is an anticorrelation
between the expansion velocity and the axial ratio and decline time t(3)
for nova remnants with ellipsoidal morphology, and a correlation between
their axial ratios and decline times t(3), confirming theoretical
expectations that the fastest expanding novae have the smallest axial
ratios. We note that the high expansion velocity of the nova shell HR
Del of 615 km s(-1) is inconsistent with its long decline time t(3) of
250 d.
Filiaciones:
Santamaria, E.:
(Corresponding Author), Univ Guadalajara, CUCEI, Blvd Marcelino Garcia Barragan 1421, Guadalajara 44430, Jalisco, Mexico
(Corresponding Author), Inst Astron & Meteorol, Dept Fis, CUCEI, Av Vallarta 2602, Guadalajara 44130, Jalisco, Mexico
Univ Guadalajara, CUCEI, Blvd Marcelino Garcia Barragan 1421, Guadalajara 44430, Jalisco, Mexico
Inst Astron & Meteorol, Dept Fis, CUCEI, Av Vallarta 2602, Guadalajara 44130, Jalisco, Mexico
Guerrero, M. A.:
Inst Astrofis Andalucia, IAA CSIC, Glorieta de la Astronomia S-N, E-18008 Granada, Spain
Zavala, S.:
Tecnol Nacl Mexico IT Ensenada, Dept Ingn Elect & Elect, Ensenada 22780, Baja California, Mexico
Ramos-Larios, G.:
(Corresponding Author), Univ Guadalajara, CUCEI, Blvd Marcelino Garcia Barragan 1421, Guadalajara 44430, Jalisco, Mexico
(Corresponding Author), Inst Astron & Meteorol, Dept Fis, CUCEI, Av Vallarta 2602, Guadalajara 44130, Jalisco, Mexico
Univ Guadalajara, CUCEI, Blvd Marcelino Garcia Barragan 1421, Guadalajara 44430, Jalisco, Mexico
Inst Astron & Meteorol, Dept Fis, CUCEI, Av Vallarta 2602, Guadalajara 44130, Jalisco, Mexico
Toala, J. A.:
UNAM Campus Morelia, Inst Radioastron & Astrofis IRyA, Apartado Postal 3-72, Morelia 58090, Michoacan, Mexico
Sabin, L.:
Univ Nacl Autonoma Mexico, Inst Astron, Apdo Postal 877, Ensenada 22860, Baja California, Mexico
Green Submitted
|