Well, I've got a backlog to try to work my way through. Thick end of 100 days, which would be pushing 10,000 papers, if I looked at everything. But I've already blindly thrown about 90% of that over the side. Probably including some tatties. Oh well. Modify the default template with the "fonty" stuff.
Nothing attractive in the first part of the pile. But I should go back to the previous post and add anything I see in the archives for T.CrB.
Did the T CrB (see - even i'm not consistent in the abbreviation used!) submission to Slashdot - with a Tyop in the title. Quick look through another day's worth of IArχiv, then bedtime. Bit of a collection post.
Article List.
| Link | Description |
|---|---|
| HTML | Recent HTML Learnings - 2024-04 |
| T CorBor | Article submitted to Slashdot |
| Quadruple massive star system | Arχiv, non-planar system (decided against it) |
| NGC 708 | A 10-billion solar mass black hole in a low dispersion galaxy with a Kroupa IMF (decided against it) |
Recent HTML Learnings - 2024-04
I learned a little about using external fonts, specifically from Google, but I should be able to generalise it, if it's worthwhile. (I'm dubious enough about Google's committment to keeping these fonts generally available, or any of their self-interested "philanthropy", but that'll be another thing to work on.)
This block should be in a silly font. "Google Monoton ". Nope, I'm borked again. Forgotten how to make it work. [...]
Fixed it now. Different funny font, "Jacquard 12 Charted" at 30 pix.
Back to RTFM, and improve my notes.
Where did I (initially) go wrong? I've got (1) the link in the HEAD section, then (2) the font family chosen in the (CSS)STYLE section. (I use PRE for demonstration. Meh.)
The example given encloses the URL for the stylesheet link in only one set of quotes - which is problematic when there are spaces in the font name. Let's get rid of that (and put single-quotes on the outside) for starters.
Yep, that did it. So, names with spaces now.
That looks a bit odd. (Note the different quote marks.) rel="stylesheet" href='https://fonts.googleapis.com/css?family=Monoton|Major Mono Display'
works, but I'm sure there were warnings about mixing names with spaces in there. Oh well. Lesson learned, into the default header it goes.
I've also done a little paragraph-level formatting with p style="font-size:30px ; font-family:'Jacquard 12 Charted'"
above. Note the arrangement of different quotes in there.
Back to Article List.
T Corona Borealis - submitted
The naked-eye shy will (briefly) host a new star.Fuck - check the BODY and you'll have a tyop in the title!
Well, I do hope the editors do catch that. At least I'm a lot more polite about them than the average Slashdotter.
Back to Article List.
A Quadruple System with A Massive Star
Arχiv 2403.12771Looks moderately interesting. Total system mass ~25 M☉, of considerably differing sizes, thus MS-durations. Not co-planar (now that's surprising - worse then Pluto-Sun-Jupiter, without the tail-wags-doggery). There's a chain of logic implied from the distribution of system masses to the range of bound NS-NS and NS-BH potential future systems, and a difference between expected [NS] and [BH] occurrence rates seen in GW mergers. Which will need more brain cell than I have tonight. This morning, even.
Abstract
Hierarchical massive quadruple systems are ideal laboratories for examining the theories of star formation, dynamical evolution, and stellar evolution. The successive mergers of hierarchical quadruple systems might explain the mass gap between neutron stars and black holes. Looking for light curves of O-type binaries identified by LAMOST, we find a (2+2) quadruple system: TYC 3340-2437-1, located in the stellar bow-shock nebula (SBN). It has a probability of over 99.99\% being a quadruple system derived from the surface density of the vicinity stars. Its inner orbital periods are 3.390602(89) days and 2.4378(16) days, respectively, and the total mass is about (11.47 + 5.79) + (5.2 + 2.02) = 24.48 M☉. The line-of-sight inclinations of the inner binaries, B$_1$ and B$_2$, are 55.94 and 78.2 degrees, respectively, indicating that they are not co-planar. Based on observations spanning 34 months and the significance of the astrometric excess noise ($D>2$) in Gaia DR3 data, we guess that its outer orbital period might be a few years. If it were true, the quadruple system might form through the disk fragmentation mechanism with outer eccentric greater than zero. This eccentricity could be the cause of both the arc-like feature of the SBN and the noncoplanarity of the inner orbit. The outer orbital period and outer eccentric could be determined with the release of future epoch astrometric data of Gaia.
Looks worth a read.
Back to Article List.
Triaxial Schwarzschild Models of NGC 708: a 10-billion solar mass black hole in a low dispersion galaxy with a Kroupa IMF
2403.12144I met Kroupa IMFs last week - oit's the 4-class IMF, with different power laws indices for each successive mass class.
Look at this one too. Might help me modelling the IMF (and other models).
That's enough for tonight.
Got up to the start of March (mostly by throwing lists away un-examined). I need to thin down (or increasingly specialise) IArχiv for the weighted list. No more work here, just separate posts tomorrow on the "interesting" stuff.
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