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In [[astrophysics]], the '''von Zeipel theorem''' states that the [[radiative flux]] <math>F</math> in a uniformly rotating star is proportional to the local effective gravity <math>g_\textrm{eff}</math>. Specifically, | |||
: <math>F=-\frac{L(P)}{4\pi G M_{*}(P)}g_\textrm{eff}</math> | |||
where the luminosity <math>L</math> and mass <math>M_{*}</math> are evaluated on a surface of constant pressure <math>P</math>. The [[effective temperature]] <math>T_\textrm{eff}</math> can then be found at a given [[colatitude]] <math>\theta</math> from the local effective gravity | |||
: <math>T_{\textrm{eff}}(\theta)\sim g_{\textrm{eff}}^{1/4}(\theta)</math>.<ref>{{cite journal | |||
| last = von Zeipel | |||
| first = Edvard Hugo | |||
| title = The radiative equilibrium of a rotating system of gaseous masses | |||
| journal = Monthly Notices of the Royal Astronomical Society | |||
| volume = 84 | |||
| pages = 665–719 | |||
| date = 1924 | |||
}}</ref><ref> {{cite journal | |||
| last = Maeder | |||
| first = André | |||
| title = Stellar evolution with rotation IV: von Zeipel's theorem and anistropic losses of mass and angular momentum | |||
| journal = Astronomy and Astrophysics | |||
| volume = 347 | |||
| pages = 185–193 | |||
| date = 1999 | |||
|bibcode = 1999A&A...347..185M | |||
}}</ref> | |||
<!--The von Zeipel law, named for its creator, Swedish astronomer Edvard Hugo von Zeipel, has been used for the better part of a century to predict the difference in surface gravity, brightness and temperature between a rapidly rotating star's poles and its equator. In 2011, using a technique called interferometry [[University of Michigan]] researchers essentially zoomed in to take close-up pictures and measurements of the winter star [[Regulus]]. It's the brightest star in the constellation Leonis and if it were spinning just a few percent faster, it would fly apart. The astronomers found that the actual difference in temperature between its equator and poles is much less than the old theory predicts. "Our model fitting of interferometry data shows that while the law correctly describes the trend of surface temperature variation, it deviates quantitively," said Xiao Che, a doctoral student in the Department of Astronomy who is first author of a paper on the findings to be published in Astrophysical Journal on April 20. "It is surprising to me that von Zeipel's law has been adopted in astronomy for such a long time with so little solid observational evidence." It's important to get this number right, says John Monnier, an associate professor in the U-M Department of Astronomy. "In some cases, we found a 5,000-degree Fahrenheit [2800 kelvins] difference between what the theory predicts and what our actual measurements show," Monnier said. "That has a big effect on total luminosity. If we don't take this into account, we get the star's mass and age and total energy output wrong."--> | |||
==References== | |||
{{reflist}} | |||
[[Category:Stellar astronomy]] | |||
{{astronomy-stub}} | |||
Revision as of 21:09, 25 January 2014
In astrophysics, the von Zeipel theorem states that the radiative flux in a uniformly rotating star is proportional to the local effective gravity . Specifically,
where the luminosity and mass are evaluated on a surface of constant pressure . The effective temperature can then be found at a given colatitude from the local effective gravity
References
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The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more
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In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang
Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules
Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.
A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running
The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more
There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang