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, 2003, 80, 2, . 107-117

524.7-8

S0- NGC 80
c 2003 .
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2

. .. , , 2 , . ,
03.04.2002 .; 23.05.2002 .

NGC 80 - - : 5 -7 - 7 . , 10 . . , NGC 80 : 2-2.5 , , [Mg/Fe] +0.3. NGC 80 : 11 , , , . , NGC 80 . , - .

1. - , , , , (. NGC 4736 - [1], NGC 7742 - [2] ). , , [3, 4]: , , , , , , , . , ; (NGC 7217 [5]) [6, 7]. , , , , ? , [8]. -

: 2-3 . , - 100-400 (NGC 1023 [9], NGC 7331 [10]). , , 10-12 . , , , , ( 1 . ), . - , , , 25-50% , "" "" - , , . . "" , , - 107


108 1. NGC 80 (NED) R25
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.

SA021

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13.03 -21.43 0.94 0.64 5698 / 78 (H0 = 75 / ) 28 ?
o

M

B

(B - V )0 (RC3) T (U - B )0 (RC3) T Vr (NED) (LEDA) (LEDA) PA
phot

: , (. 1, [14]), NGC 80 [15]. vlos,max < 15 / [16], , , . , , , NGC 80, , . 2. NGC 80 (MPFS) 6- ( . [17]) 17 1996 . MgIb А 5175 ( 4880-5650 A) А 1.6 A/ ( А 4 A) 2.5 . 1 , 20 . "" , . - 520 з 580 "". MPFS 8 з 12 , . 96 , , 1.6 з 1.6 . -- , - . - , , , , - , [18]. MPFS А 4880-5650 A , -, , -,
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, . - HII- 1 E0 NGC 759 [11]. : . [12] 2.4 з 109 M , . , , , , . , NGC 759 . . , , [13]. NGC 80. . 1. ( RC1), ( UGC): , 9 NGC 16m (MB < -18.5). NGC 80 "", .




2. NGC 80 29.11.97 29.11.97 29.11.97 18.07.01 18.07.01 16.08.01 16.08.01 16.08.01 16.08.01 17.08.01 17.08.01 17.08.01 17.08.01 1.2 , OHP 1.2 , OHP 1.2 , OHP 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, B V R V R B V R I B V R I , 10 5 5 30 35 20 10 10 15 20 10 10 10 , . 3.1 2.8 2.5 1.9 з 2.3 1.8 з 2.2 3.2 2.9 2.6 2.8 2.2 2.0 1.8 1.8 , . /. 0.69 0.69 0.69 0.27 з 0.37 0.27 з 0.37 0.27 з 0.37 0.27 з 0.37 0.27 з 0.37 0.27 з 0.37 0.27 з 0.37 0.27 з 0.37 0.27 з 0.37 0.27 з 0.37

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. 1.6", .. . / , , , . H , Mgb, Fe5270 Fe5335 [19]. [20, 21]. - - K0-K2, , . - А 5577 A. 20 / А 0.1 A. ; NGC 80, , .
80 2

NGC 80 - 2001 . 1- Zeiss . -

3.0 2.5 2.0 1.5 1.0 5.5 5.0 4.5 4.0 3.5 4.0 3.5 3.0 2.5 2.0 -1



Mg b

H

0

1

2

3 r

4

5

6

7

. 1. H , Mgb Fe (Fe5270 + Fe5335)/2 NGC 80 ( ); . [24] 2 з 4 ( ).

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110
Fe 4 T = 17 T = 12 T=8

.

3

nuc

2

1

0 H 2.7

1

2

3 Mg b

4 T T T T T T = = = = = =

5

6

2.3

5 [Mg / Fe] = 0.3 10 [Mg / Fe] = 0.3 15 [Mg / Fe] = 0.3 5 [Mg / Fe] = 0 10 [Mg / Fe] = 0 15 [Mg / Fe] = 0

1.9

1.5

nuc

1.1 1.0

1.4

1.8

2.2

2.6 Fe

3.0

3.4

3.8

. 2. "-" NGC 80 ( ). MPFS 1.6 R, `nuc'. , ( - [Mg/Fe] = +0.3 [Mg/Fe] = 0), - [20] () [21] (). T . . , , +0.50, +0.25, 0.00, -0.22, -0.50, -1.00, -1.50, -2.00 [20] +0.4, 0.0, -0.7 [21].

520 з 580 "" 18 з 24 . 397 з 580 . c 0.37 . - [22]; (17 2001 .) [23]. . 2. , FITS-, HYPER-

CAT. 1.2- 3 0.7 /., , . 3. "" NGC 80 , , 0 -7 , . 1. , , , Fe
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111

А 2.9-3.2 A А 0.1 A. А 0.7 A . ( 2.5 R 3 ) , `' . , . 1 , NGC 80 . [20], А Mgb 0.7 A 2 . , , : (., , [25]). , , "-". , , А , Mgb = 0.7 A, , `' . - , . . 2 ` Fe , Mgb', [20] [Mg/Fe] = 0. , -2 +0.5 [Fe/H], , , NGC 80 , [Mg/Fe] = 0. [26]; ( -) - 1 . . NGC 80, . 2
80 2

[Mg/Fe] = 0 . [21], [Mg/Fe] +0.3. Mg/Fe , `', R 3 ), . . 2 : `H , Fe ' NGC 80 . [21]. . [21] Mgb, [Mg/Fe], [20], , . . [21] [Mg/Fe] = 0 [Mg/Fe] = +0.3 - `' . . 2 , Mg/Fe `', 2-3 . . , - 7 . , , , , 5 -7 7 . . "" , R 2 , "" , , 10 . . , , , 6 , - 7 . - , 10 . [27]. - , , - , . 4. NGC 80 , 2, , 17 2001 ., , BVR , BVRI- 17 - . . 3 : . ,

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.

195А 190 185 180 175 170 165 0.15

()

B V R

PA 1 - b/a

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0 300А 280 260 PA 240 220 200 180 160 0.10 1 - b/a

10

20 (З)

30

40 B V R I

50

60

70

80

0.05

0

5 a

10

15

. 3. - - NGC 80 1.2- (a) , 1- 17 2001 . (). - 3 , - 2 .

, NGC 80, - ; LEDA (. 1) i = 28 , 0 , .. . (1 - b/a)0 = 0.09, , 25 . ,

10 ; , R 10 NGC 80 - , , , "" , , . 30 -45
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16 17 18 19 20 ЕR, С,. ,ТЮ./ Э,. вТЭ. л,,Ы 21 22 23 24 0 16 17 18 19 20 21 22 23 24 0 10 20 30 40 50 0 R 20 40 60 80 20 40 60 80 0 5 10 15

. 4. R: - ( ), ; - , ; - (, 8 -80 ); - .

, 1 - b/a 0.1. , PA0 180 , 5 , . . 3 , , . . 3 , . 3, 17 2001 . NGC 80. , B 2.2 , - 2 . , , : 90 , 0.03 R = 2.5 , - ( B V ) 0.08-0.09.
2 80 2

R 3 - , , . . . [28] NGC 80 V ; NGC 80 90 , 0.15. , NGC 80, , . ( R . 4). . 3, R 35 -40 : -, . , , , - , - . ,

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3. NGC 80, () Е0 , ../.. (2D) 21.7 19.5 r0 27.3 5.6 V - (40 -77 ) (8 -27 ) 20.8 18.5 28.3 5.7 R- (40 -77 ) (8 -27 ) 20.1 17.9 27.3 5.5 20.28 Б 0.01 18.04 Б 0.01 28.8 Б 0.1 5.84 Б 0.01 10.9 2.2 20.90 Б 0.01 18.63 Б 0.01 29.4 Б 0.1 6.01 Б 0.02 11.1 2.3 Е0 , ../.. 21.82 Б 0.01 19.66 Б 0.02 r0 28.7 Б 0.2 5.91 Б 0.04 r0 , 10.8 2.2

B - (40 -75 ) (10 -24 )

B R 10 -46 R1/4 ; , , R < 40 , "" [29, 30]. : re = 36 , 13.6 , Be,0 = 24.14, 1m ( ) [31] Be,0 = 19.74 + 3.02 lg re , 11 , , , [32]. , "" . NGC 80 , R 8 -28 (. 4), , , ( 2 ) ; 3 , . , R 10 -80 (. 4); "" , . NGC 80

BV R . 3; , : ; , . NED. , NGC 80 . , - , [33]. , , , , , R 10 . NGC 80 R 7 -8 (. 4). , , . , . 5 NGC 80 2001 ., -; R = 10 -20
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1.25

B-V B-I V- I

1.15

1.05

2.5

2.4

2.3

1.4

1.3

1.2 0

10

20 r

30

40

50

. 5. NGC 80 1- : - 17 2001 ., - 16+17 2001 .

17 , , - 16 17 . "" R = 7 -8 , , R = 6.3 , . 5 . 2. , R 12 . , (B - V ) = 0.12 [m/H] = +0.4, .. ( . [34]). , [m/H] = +0.3. R > 12
80 2

, , , , , , . NGC 80 . , , , , , , (. B - I V - I . 5) , . 5. NGC 80, ( ), :
2*

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.

(R = 2 -7 ) +0.3- +0.4 dex 2-2.5 . NGC 80: R = 5 -8 5-7 . , . , , , 2-3 . , [Mg/Fe] +0.3, [Mg/Fe] 0, , , ( ), , , . , , ( ), NGC 80 . NGC 80 . : , , . , , , . , , . - - - , . NGC 615 [35] NGC 7217 [36], , ; , . (, NGC 4429 NGC 7013) [37] - NGC 80, , 0.5 . - ", -"

, - . NGC 80 . , , m = 0 ? - , ? . : , NGC 80 , . , - (), , NGC 80 . .. , .. .. 6- .. - 1- . , , 6- , ( 01-43). , 1.2- HYPERCAT. - (LEDA), LEDA CRAL (), / (NED), (). ( 01-02-16767) - ". " ( "") 1.2.4.1.
1. D. Maoz, A. V. Filippenko, L. C. Ho, et al., Astrophys. J. Suppl. Ser. 107, 215 (1996).
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2. P. T. de Zeeuw, M. Bureau, E. Emsellem, et al., Monthly Notices Roy. Astron. Soc. 329, 513 (2002). 3. R. Buta, Publ. Astron. Soc. Pacific. 105, 654 (1993). 4. R. Buta and D. A. Crocker, Astron. J. 105, 1344 (1993). 5. R. Buta, W. van Driel, J. Braine, et al., Astrophys. J. 450, 593 (1995). 6. R. Buta, Astrophys. J. 370, 130 (1991). 7. L. Athanassoula, Barred Galaxies (Eds. R. Buta, D. A. Crocker, and B. G. Elmegreen, ASP Series, 1996), V. 91, p. 309. 8. O. K. Sil'chenko, Astron. and Astrophys. Trans. 20, 123 (2001). 9. O. K. Sil'chenko, Astron. J. 117, 2725 (1999a). 10. O. K. Sil'chenko, Astron. J. 118, 186 (1999). 11. V. V. Vlasyuk and O. K. Sil'chenko, Astron. and Astrophys. 354, 28 (2000). 12. T. Wiklind, F. Combes, C. Henkel, and F. Wyrowski, Astron. and Astrophys. 323, 727 (1997). 13. . . , . . 71, 706 (1994). 14. R. Buta and K. L. Williams, Astron. J. 109, 543 (1995). 15. P. Chamaraux, C. Balkowski, and P. Fontanelli, Astron. and Astrophys. 165, 15 (1986). 16. P. Prugniel and F. Simien, Astron. and Astrophys. 282, L1 (1994). 17. . . , . . , . . , . . , 54 (1990). 18. . . , . . (. ). 36, 107 (1993). 19. G. Worthey, S. M. Faber, J. J. Gonzalez, and D. Burstein, Astrophys. J. Suppl. Ser. 94, 687 (1994).

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20. G. Worthey, Astrophys. J. Suppl. Ser. 95, 107 (1994). 21. R. Tantalo, C. Chiosi, and A. Bressan, Astron. and Astrophys. 333, 419 (1998). 22. P. Poulain, Astron. and Astrophys. Suppl. Ser. 72, 215 (1988). 23. A. U. Landolt, Astron. J. 104, 340 (1992). 24. S. C. Trager, G. Worthey, S. M. Faber, et al., Astrophys. J. Suppl. Ser. 116, 1 (1998). 25. . . , ?. .Л 19, 693 (1993). 26. G. Worthey, S. M. Faber, and J. J. Gonzalez, Astrophys. J. 398, 69 (1992). 27. O. K. Sil'chenko, Galaxies: the Third Dimension (Eds M. Rosado, L. Binette, and L. Arias, 2002). In press. 28. G. Magrelli, D. Bettoni, and G. Galetta, Monthly Notices Roy. Astron. Soc. 256, 500 (1992). 29. J. Kormendy, Astrophys. J. 217, 406 (1977). 30. W. E. Baggett, S. M. Baggett, and K. S. J. Anderson, Astron. J. 116, 1626 (1998). 31. J. Kormendy, Astrophys. J. 218, 333 (1977). 32. R. S. de Jong, Astron. and Astrophys. 313, 45 (1996). 33. K. C. Freeman, Astrophys. J. 160, 811 (1970). 34. A. Vazdekis, E. Casuso, R. F. Peletier, and J. E. Beckman, Astrophys. J. Suppl. Ser. 106, 307 (1996). 35. O. K. Sil'chenko, V. V. Vlasyuk, and F. Alvarado, Astron. J. 121, 2499 (2001). 36. O. K. Sil'chenko and V. L. Afanasiev, Astron. and Astrophys. 364, 479 (2000). 37. O. K. Sil'chenko and V. L. Afanasiev, Astron. and Astrophys. 385, 1 (2002).

THE CHEMICALLY DISTINCT NUCLEUS AND STRUCTURE OF THE SO GALAXY NGC 80
O. K. Sil'chenko, S. E. Koposov, V. V. Vlasyuk, and O. I. Spiridonova
The giant lenticular galaxy NGC 80, which is the brightest member of a rich group, possesses a central evolutionarily-distinct region: the stars in the nucleus and in a circumnuclear ring of radius 5 -7 have a mean age of only 7 Gyr, whereas the stellar population of the bulge is older than 10 Gyr. The nucleus of NGC 80 is also chemically distinct: it is a factor of 2-2.5 richer in metals than its immediate neighborhood, and is characterized by a high magnesium-to-iron abundance ratio [Mg/Fe] +0.3. The global stellar disk of NGC 80 has a two-tiered structure: its outer part has an exponential scale length of 11 kpc and normal surface density, while the inner disk, which is also exponential and axisymmetric, is more compact and brighter. Although the two-tiered structure and the chemically distinct nucleus obviously have a common origin and owe their existence to some catastrophic restructuring of the protogalactic gaseous disk, the origin of this remains unclear, since the galaxy lacks any manifestations of perturbed morphology or triaxiality.



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