1° Forum di Astronomia Amatoriale Italiano

Conoscete SS 433? Un oggetto più unico che raro, oggetto di discussioni da decine di anni, ebbene
eccovi un papero molto interessante sulle sue possibili origini:

https://arxiv.org/pdf/2004.12547.pdf

Buona lettura.
Roberto Gorelli

ABSTRACT
SS433 is an extraordinary X-ray binary which is ejecting bipolar jets with 26% of the speed of light.
Associated with the supernova-like shell W50, SS433 is also probably one of the youngest X-ray binaries
with an age of . 105 yr. However, the masses of the two components in SS433 and even the nature
of the compact object are still under debate. In this work, assuming that the compact object is a
black hole, we employ a binary population synthesis method to study the formation of SS433. We use
previous estimates of the age of W50 and the duration of the jet activity to constrain the evolutionary
history. Our calculations suggest that SS433 likely harboured a Hertzsprung gap star at the beginning
of the current Roche-lobe overflow phase. The masses of the black hole and the optical/donor star in
SS433 suggested by the simulations are around 8 M and 24 M, respectively. Future measurement
of the donor mass and radius can help infer not only the orgin of the binary but also the nature of the
nebula W50.
Keywords: stars: black holes - stars: evolution - X-rays: binaries - X-rays: individual (SS433)

Ho fatto un copia/incolla per gli anglofoni.

_________________
Costanzo
"Una cosa ho imparato nella mia lunga vita: che tutta la nostra scienza è primitiva e infantile
eppure è la cosa più preziosa che abbiamo" (A. Einstein).