Warrick

Göttingen, Germany

Age: 30

Postdoctoral researcher, Institut für Astrophysik Göttingen.

1d
comment What practical considerations are there for amateur observations of transiting exoplanets?
I'd question the statistics of that detection, but that's some feat. I had no idea you'd be able to get anything at all with consumer-level hardware!
1d
answered How do you define the diameter of the Sun
1d
awarded Popular Question
Dec
17
comment Resolving power of ultra-telescopes
@RobJeffries: the idea of an interferometric array is the idea behind Antoine Labeyrie's "hypertelescope", which occasionally gets coverage.
Dec
16
awarded Enlightened
Dec
16
awarded Nice Answer
Dec
13
awarded Popular Question
Dec
12
comment Where can I find the image of MY Camelopardalis?
Fig. 6 is a "representative" drawing, but I think you're right that there's no direct imaging.
Dec
10
comment How should one rationally deal with the issue of space travelling alien civilizations?
I worry that this question can veer dangerously into pure speculation, but Florin's answer is an excellent (and very objective) summary of current approaches to what is (and will probably for a long time remain) an open question.
Dec
9
comment What is the most oblate astronomical object known?
I started writing my own answer but realized I wasn't adding much more than this one. In general, Be stars are thought to have circumstellar disks from marginally bound material being lost from the surface. Achernar is also rotating very rapidly: I get f=0.44.
Dec
8
answered Why is there a black stripe in the Hubble images of Pluto?
Dec
4
answered Can objects enter hydrostatic equillibrium through processes other than the influence of gravity?
Dec
1
comment What is "Median Stellar Mass"?
Is it "median" stellar mass you don't understand? That's a fundamental statistical concept (see e.g. Wikipedia). Or is it "characteristic" mass you don't understand? Or the reason they use logarithms? Your question asks a different question to your comments.
Dec
1
comment What is a low mass Black Hole?
Well, in that case, the answer to your question is in the abstract. :) "Here we focus on searches for black holes with masses of 10^4-10^6 solar masses that are found at galaxy centers. We will refer to black holes in this mass range as 'low-mass' black holes, since they are at the low-mass end of supermassive black holes." But it's not standard.
Nov
26
comment What is a low mass Black Hole?
In what context did you see the term "low mass black hole"?
Nov
24
awarded Commentator
Nov
24
comment stellar evolution fortran code-runge kutta mass step from center to fitting point
Your question isn't particularly clear, nor am I sure that it's suitable for Astro.SE. But even so, have you rescaled or reformulated the variables? Most stellar evolution codes actually use things that vary stably as you approach the centre. e.g. $m^{2/3}$ instead of $m$. In addition, state variables are usually treated in logarithmic form. i.e. the codes track $\log T$ and $\log P$ rather than $T$ and $P$. The pressure in particular may vary by a factor of about $10^12$ in a solar model.
Nov
21
comment Does degeneracy affect the adiabatic relation?
No time to answer properly now, but I'm with @KyleKanos that it's a coincidence. For the white dwarf, $K$ can be computed for a given mean molecular weight. So it's the same in all white dwarfs. In the ideal gas relation, however, I think $K$ is set by the entropy/temperature of the gas, and can thus vary. I stand to be corrected, though.
Nov
18
revised Why does a photon take less than a week to come out of the convection zone of the sun?
quantas -> quanta
Nov
17
answered Without using absolute magnitudes or isochrones, how might we tell a star's age and evolutionary status?
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