Äîêóìåíò âçÿò èç êýøà ïîèñêîâîé ìàøèíû. Àäðåñ îðèãèíàëüíîãî äîêóìåíòà : http://star.arm.ac.uk/preprints/410ep.pdf Äàòà èçìåíåíèÿ: Tue Mar 7 18:31:49 2006 Äàòà èíäåêñèðîâàíèÿ: Mon Oct 1 23:05:47 2012 Êîäèðîâêà: Ïîèñêîâûå ñëîâà: ï ï ï ï ï ï ï ï ï

j Hþ n| q| l | j æ j µ t wþ n

H ®ç (ï fw nî Qø µ cÞ cÞ ½

v kî t Hj Þ h H½ e · 2guv hlj k· ¨í f¨ ï v hj de µ w fg · @z rj ï ¯ã ª ¢j qã q j k· ¢j qã q j v ¨ ng c Hp h He j k· ¨ H¿ Hhp

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Þ | | qø f¨ f¨ f¨ ·

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rj ï | d½ (s | ¯ûQs r| ï r| ï | û

r| n¾ | · w õ n õ j

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¨ cî æ v ¨ ¨¨ ñ¨ ææ vv ¨¨ ¨f¨ ·¨ æ&t vv ¨¨ ¨¨ ¨cñ æt v v wÄ æÖ Ö · {Á æ À v &p de ôë (p ª {rn¾ p g ¢ (p

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( d qy ¨x Q1 P©

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di {j hg fe k| qp Ed & E%

d | i hg fe ¥ DC

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Introduction

Abstract

Composite sdB stars

Figure 2. Normalized blue spectrum of the composite PG 2110+127 (a) together with the best fit composite model spectrum (b) formed by adding models with (c) and (d) with a radius ratio R /R =4.7. Model spectra have been velocity shifted and degraded to match the obser vations. marks a CCD defect.

ei W u g dp ¿ fþ ¨ e We p r| ¨ d ¨ª f¨ f uo ¾ (g m } ¿ Þ ¨ fä g p n cû H¾ r d¿ h fe (H e Åü

Figure 3. Position of single (filled circles) and com) posite sdB stars (filled triangles) in the (log g ­T diagram. Open circles represent the position of an homogeneous (Maxted et al. 2001).

n fe E m n g ( m m þ ä W k j v ¨ g H´ g m Bþ i e p þ k

p nfe ª n j¨ ( q g m

e n Q ë m v ®Ü k Hp

g ¯ ä eh h W ni é f¨ p I

h rg à å | Hfp ê Hg

k· {é ¨ (g m¨ Ã o c k ng dþ

mV ( 2 nifp p fp n¾

q| g m h gH nj E 2 d éHh h e2 g Hg

h H¿ Hp Vg f · m H´g e B e

( g qe h pdi fe f½ ªg¢ pf 2 ¿

qp | h ¯p ¯ è Vn H WÑ fe e m g (¿ g }m ff½ ªg (

qn ¢å &g g p H h ¿ Ee h ¢ H m

n å de ÙÝ g B¿ ¨Ø h fe à h e fp ¿ c¾ E 2 W {r nm dgH g Bhp hHe n H¿ di d½ W Hp 2 (p m c H {r np hp H Re ª de ¯ è g p m ¨ W d g W p h e H2 p {r f dfe é i g nÇu½ ªe h ãe ªpp kgg W¾ p w n n fï k j h W¨ w w "v} g p g ½ d u c {r q m p feg & h We h de n q g ½ n Q H àp v¾ g¨ H´ ¨ B k ne ( |é n p v qpd å¨ H´ ¿¨ WÑ g hp fe h p¨e h e ªp if¾ e p n g m e k E p n h e fp¢ ª¾ k n g de ë ¯j ur g{é p2 p gp p Hp¨ h V¿e ªp ku¾ n gq deª g hp {r fe ké p p & h  e ªpj n ¾ d h H de h W {r i e p q é

p pg åpm p pg å ¿p à s p p ¿ p p ég pm

Å wÄ Ö Ö Á Å

j n é k· ¨ d f¨ H½· å p dþ di Hþ n H dg p q¿ m c idi Vã } g ( n gH nde Hd g&g p r ¿ þ we þfþd p n( ¢ fe ( }g V we m H g hp fe w½ u de ¾ ® r H{r f¯

¨¿ n n ug wi g g Hp hp p

E m j¯ i è õh de Vã p g u ¨ p¢l d n n e qô g B½ ( k n{e cpf½ (Tg 2 de¾ à ¯| d p Hm e m Hg }½ Q d g f½f½ ug}g gH pmg hp n fep hp gew

Eå Q hp

p d He ¿ g u p Bl h f e q h I~ g ce hp Hen| fe h hnjp e H n h gde p¿ & u i dm (¿ h {r d B ki ( Em He h de m fekg hg} h Be e f½ n di Hng H h u We g p k| He di

Obser vations

H p k hp n dhp ( g ( ( d m ¯ né m ¯j ng nm f

p ¨ Ã ( g

q | é f¨ · qè B dee p Wg ¯| de dp ¨¿ è p hp ¢ k g { j x f È x e ( n p qp ¿ g · qå k m ª e m n| (¿ ¾ g (¤i d½ nj ( d Bm ¾ (

dþ g

m &p Hep è q He h h é{r nÛà qp å fð H e f½ Hp E fhg gªþ

gg ¨ eV¿

p H m p pm de g g w¿ g è Hp V h E½ ( õ à ëà ue Ñ q H (¾ E ¾ ¿ m

dg

n pn¾ (p é ki Hm ¯g( Hg pp p pHf é

| ð¨n| ¨ ÿ¨ å dþ "p ®

hæ ¤ð g'ó H p h He hg ue ( ¾ f m

V¿ g hp He m gH½ p dþn 2 '¾ z ¨ Wí ¯ Iì ¨~

g' n dh H we ( ¢B d hh e(e Be fe fe

Spectral Analysis

Figure 4. Position of cool companions to composite sdB stars in the (log g ­T ) diagram. Labels refer to sequential number in Table 1.

fsp ( |g ké } Þ &p H| h g V g h ëe}p ü dÄ Ö Ö Á ü

Figure 1. Normalized red spectrum of the composite PG 2110+127 around the infrared calcium triplet (histogram) together with the best fit model spectrum (polyline).

¨ è õ j }| t ¨o · · g p ï Æ n H p h ¯y zlj ¢| ¯û |j vr ø ¨ ¿ f¨ dg ¨· fè ï |H| vñp ¨w H´´ v¨ ì | ¼ ¨| í h e fä I û 'Ï Ã w cvj | n| ï | õ Wl j h| Hv di W~ Þ v¨ n è q ~õ 2 l qô 2 l ñ w w qô d q | õ j ¢| W ( H q HþHþ p p g

ké {ñ H| Qp g H p p h ng e }

Hp ªp (¾¨

(¿ ¼ Eåm (¿ nng H n h we h H we

Helium Abundances

ug c| qø w rã

"e p d u Ñ ÒÑ Îà p à H de » {r H

Ñ ng ¾ ¤v ¨ h H´ u Vj ( mÎn Hh

p ¾ f E¾ né v f½ we ¨ Hp ë di k ' n h H p m

®g H ¨ f¨ i· ¨ e &p n h

Óå (g nj | m g e edp (¿dp dg rg f g (¿( d½ E

T de e ( I m gm ë& h 2eh h e n d

p nm nj ¨ c fè feg g ¼

H I f½ &g {r | Îï E Hm n (¿H ( g ½ V

H¿ H fph fe ¾ &Eg g Õ g¯Ð ßm E

m m Á ¿

n H ¿ er " d¿ ( ¿qç q fz h de pcø f e hE (¿ ¨e ¯ü H¢â g B p pp (¿ n n 'eH k hp w d gw p v B å n ng (¿ d½ 2 h¾

(g h fe r nm H ªç m Hsg Vïug Ql | ¨ e p di E m á h ®e i n pE e ¨ è ' g m Bm ¨g 3í H¿ h i de Iãqe þ p m W

p k m

(g nô H q né v' ¨ª f¨ ·h He |H m (¿ E ¿ Hp (g h ¢ ¢ ¨ 2 p 'e V den ¤ d½ {r d ( I ª dim n g ¯ g èu f½ õ ¢g ki B n feô p Wm g 2pu f½f½ qgg e

(÷ p e ng '(g ¨ di fe r¯ u mè q¾ h e fp ¢¾ e nj p eu hp esf½ Hp (g k| ® h e ( r e d¿ ëe g hg m fe ¿ n p h p e Qp

õ ùå h He H qû (¿ 2ý fø ng B¾ d g¿ { h cûdenm T H r| {r (g g m (¿ g Vhp fe n B Hd½ p e {r m dnm q 2 h¾ äe pV g p g H½ g }p } ª

s hp e g ¿ s

References

n ¦ m Q di ¢

g g f ê¢ h{r e d p (

W n¾ f½g u &g g (¿

We h p h fe e ¼ g

(å qg ªph deW ë¾ "

Hm (¿ de ¤ q}y cÔr e ¢g m fe¿

¨ E ke h nQe H h We

g &e p ÖH gÖ n {Á (¿ "À Bá

g ªþ z ú Vï q gg ¼¼g cþ n h2l 2 2e cç V¾ í g }½'ï h de h rÐ ßà fþ{e (p á ôdþ (p de n pg p B (p H nj fþ q h |fe i Ee p n Bþ p H g f Qpé µ g p p ng à

p H V n éfe fò& ¨ i ¨hm dekî ( H¿ ' hï r |¿ µg p

ñ (g ¨¶ w w He Rv m ¨ Ig

B ¨ ¨ ¨ } us d nmn 2

2 (¾ »ñ é òð h kî}¾ d w H

¨ ÿ ¨ å h µ e µ n mE¶ ¿ nw Tvf g hp6o fe p w din m u

r m qm ( ¨ ¨ ¨ h p m hgHm ëpfe

µe à

wee @ f½ n cg qô ¨y p iki m c H m p Ee h de ª p n¾ g d Hä ¨ H }ö Be g gh p & p d f n ¾ E¿ Q cp B n á hp ke Q n n h Egde & g h di q¿ e n e ¿p { } B nj h m h kg de E }i ¢ h E e nj d

&

H| m ( ½ u p we i rg 2 ê né v Hþ ¨ f¨ p · ( ¢à np Hh¯| de h fe n f½{r ( ¢g Bp hhi hm ee fpe f¾ n fe e gdpH He h rgQe (¿ dp h h e deg np k( &i ki u (

¾ wi H p e W ¾ ¡

h¿ e nf 2 ¿ &e n ¯ in m è õ Q n g ( nh ª k H n p gn q p dg ¢h hde ®e fp g ¼r

I ¥ h¯ {

¥ h W & H d n n B ¨ h h W h qd ¡ k h q d n¡ H } d H ° c w¡ H ¢ ª© n d} ¢¸ W n q E h h B I ¨¤ h k© ¨ u§ k¦ d h ¤ k ¡ d ¸ h q hw f

h k¢ nk W h H qH n I&¸ H ¥ 2 h w¡h n¢± h2¥ E¦h h w kw h¡B k hh© dn¨ H I f h hH k w¡d } d ( h h w ( h w k n H d